| Author |
Message |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3268 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 10:59 am: |      |
It's a deciliter shorter. |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 466 Registered: 6-2005
| | Posted on Tuesday, October 05, 2010 - 11:31 am: |      |
Are we talking about a comparison between two volumes of something? Liquid, solid, gaseous? Or is "it" shorter than a reference value? Than the needed quantity to achieve smth? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3269 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 11:45 am: |      |
Are we talking about a comparison between two volumes of something? Sort of. Liquid, solid, gaseous? Irr. Or is "it" shorter than a reference value? Yope. Than the needed quantity to achieve smth? No. |
Balin (Balin)
New member Username: Balin
Post Number: 5780 Registered: 4-2010
| | Posted on Tuesday, October 05, 2010 - 12:28 pm: |      |
Deciliter: unit of volume? Would the puzzle work if you'd said "it's ten liters shorter"? "It's 10 liters shorter"? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3272 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 12:53 pm: |      |
Deciliter: unit of volume? Yes. Would the puzzle work if you'd said "it's ten liters shorter"? "It's 10 liters shorter"? I could've said either of those, if the volume in question had been ten liters. |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 467 Registered: 6-2005
| | Posted on Tuesday, October 05, 2010 - 1:48 pm: |      |
Skydiving relevant, btw? :-) It: a tangible object? A quantity? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3277 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 1:59 pm: |      |
Skydiving relevant, btw? :-) No. It: a tangible object? This. A quantity? |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 470 Registered: 6-2005
| | Posted on Tuesday, October 05, 2010 - 2:11 pm: |      |
Object size: bigger than a tennis ball? than a basket ball? than a chair? than a car? Solid or hollow? Object material: metal? plastic? paper? wood? stone? How many relevant objects? 1? 2? More? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3280 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 2:24 pm: |      |
Object size: bigger than a tennis ball? Yes to this, no to the rest. than a basket ball? than a chair? than a car? Solid or hollow? Hollow(ish). Object material: metal? plastic? paper? wood? stone? Metal. How many relevant objects? 1? 2? More? 1. |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 471 Registered: 6-2005
| | Posted on Tuesday, October 05, 2010 - 2:27 pm: |      |
Is it a can? Or a container of any sort? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3282 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 2:37 pm: |      |
Is it a can? No, but close. Or a container of any sort? Yes. |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 473 Registered: 6-2005
| | Posted on Tuesday, October 05, 2010 - 2:42 pm: |      |
Relevant which liquid or substance the container is meant to contain? Is it a beverage? Is it fuel? Is it fine to think about it as a general container, or is it better to find out the exact type of container that it is? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3284 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 2:48 pm: |      |
Relevant which liquid or substance the container is meant to contain? Yesish. Is it a beverage? Possibly. Is it fuel? No. Is it fine to think about it as a general container, or is it better to find out the exact type of container that it is? It helps to find its purpose. |
Balin (Balin)
New member Username: Balin
Post Number: 5790 Registered: 4-2010
| | Posted on Tuesday, October 05, 2010 - 3:50 pm: |      |
Is the container a bottle? Jar? Glass? Barrel? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3290 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 4:17 pm: |      |
Is the container a bottle? Jar? Glass? Barrel? Neither. |
Balin (Balin)
New member Username: Balin
Post Number: 5799 Registered: 4-2010
| | Posted on Tuesday, October 05, 2010 - 4:24 pm: |      |
Is the container a tank of some sort? Is it made of wood? Plastic? Glass? Metal? Ceramic? Clay? Is it a mug? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3296 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 4:36 pm: |      |
Is the container a tank of some sort? No. Is it made of wood? Plastic? Glass? Metal? Ceramic? Clay? Metal. Is it a mug? No, but close. |
Kayleetonkslupin (Kayleetonkslupin)
New member Username: Kayleetonkslupin
Post Number: 378 Registered: 9-2010
| | Posted on Tuesday, October 05, 2010 - 4:40 pm: |      |
Do "equal and opposite reactions" have anything to do with it? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3298 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 4:42 pm: |      |
Do "equal and opposite reactions" have anything to do with it? Yes indeed. |
Kayleetonkslupin (Kayleetonkslupin)
New member Username: Kayleetonkslupin
Post Number: 379 Registered: 9-2010
| | Posted on Tuesday, October 05, 2010 - 4:43 pm: |      |
"For every action, there is an equal and opposite reaction." So Newton's Laws of Motion relevant, I take it. Just that one, or the others too? (Although the others have rather slipped my mind.) |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3301 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 4:49 pm: |      |
"For every action, there is an equal and opposite reaction." So Newton's Laws of Motion relevant, I take it. Just that one, or the others too? (Although the others have rather slipped my mind.) The second law is involved as well (F = ma, or force = mass*acceleration) |
Kayleetonkslupin (Kayleetonkslupin)
New member Username: Kayleetonkslupin
Post Number: 380 Registered: 9-2010
| | Posted on Tuesday, October 05, 2010 - 4:54 pm: |      |
Ah, thank you, Galfisk. Hmm...So...because it's smaller, it can't go as fast? Whatever the 'it' that's a deciliter shorter is? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3304 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 5:37 pm: |      |
Ah, thank you, Galfisk. You're welcome. (Thank you, Wikipedia;) Hmm...So...because it's smaller, it can't go as fast? Whatever the 'it' that's a deciliter shorter is? This is incorrect/OTWT. |
Kayleetonkslupin (Kayleetonkslupin)
New member Username: Kayleetonkslupin
Post Number: 382 Registered: 9-2010
| | Posted on Tuesday, October 05, 2010 - 5:40 pm: |      |
Drat...I hate being OTWT...I think I'll wait for a while and ask questions again when things have cleared up a bit. |
Rbruma (Rbruma)
New member Username: Rbruma
Post Number: 561 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 6:09 pm: |      |
Anything to do with pressure? A Pitot tube of some sort? Is this at least OTRT? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3305 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 6:43 pm: |      |
Anything to do with pressure? Yope. A Pitot tube of some sort? No. Is this at least OTRT? No. |
Balin (Balin)
New member Username: Balin
Post Number: 5808 Registered: 4-2010
| | Posted on Tuesday, October 05, 2010 - 7:33 pm: |      |
A Thermos? Temperature relevant? Heat? Cold? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3306 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 7:35 pm: |      |
A Thermos? No. Temperature relevant? Indirectly. Heat? this. Cold? Hint: This object was not used as intended. Separating questions about the intended and the actual use will help. |
Balin (Balin)
New member Username: Balin
Post Number: 5811 Registered: 4-2010
| | Posted on Tuesday, October 05, 2010 - 7:37 pm: |      |
Is the object intended to hold liquid? Something hot? Cold? A drink? Is the object used to hold liquid? Something hot? Cold? A drink? Does the object break over the course of the puzzle? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3308 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 8:11 pm: |      |
Is the object intended to hold liquid? Yes. Something hot? Cold? A drink? Could be either. Is the object used to hold liquid? Yes. Something hot? Briefly. Cold? A drink? No. Does the object break over the course of the puzzle? Yes, good question. |
Balin (Balin)
New member Username: Balin
Post Number: 5824 Registered: 4-2010
| | Posted on Tuesday, October 05, 2010 - 8:15 pm: |      |
Does it break because the liquid poured into it is too hot? Is the metal object cold when the hot thing is poured into it? Causing the metal to rapidly expand? And crack? Or shatter? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3310 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 8:25 pm: |      |
Does it break because the liquid poured into it is too hot? No. Is the metal object cold when the hot thing is poured into it? FA. Causing the metal to rapidly expand? And crack? Or shatter? Neither of the above. |
Balin (Balin)
New member Username: Balin
Post Number: 5830 Registered: 4-2010
| | Posted on Tuesday, October 05, 2010 - 8:28 pm: |      |
Is the hot thing poured into the metal object? Is the metal object ever cold? Hot? Does it break because of heat? Cold? Being dropped? Smashed? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3312 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 9:17 pm: |      |
Is the hot thing poured into the metal object? No. Is the metal object ever cold? Hot? Assume it stays near room temperature. Does it break because of heat? Cold? Being dropped? Smashed? This is closest, but not accurate. |
Ixoye724 (Ixoye724)
New member Username: Ixoye724
Post Number: 2767 Registered: 1-2001
| | Posted on Tuesday, October 05, 2010 - 9:20 pm: |      |
Is the metal object a can? And is it the metal object that "breaks"? Does it actually get crushed? Bent? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3314 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 9:36 pm: |      |
Is the metal object a can? No. And is it the metal object that "breaks"? Yes. Does it actually get crushed? Partially. Bent? Crushed is more accurate. |
Ixoye724 (Ixoye724)
New member Username: Ixoye724
Post Number: 2772 Registered: 1-2001
| | Posted on Tuesday, October 05, 2010 - 9:40 pm: |      |
This reminds me of an experiment in which a small amount of water is put into a metal soda can, then the can is placed over a flame, allowing the water inside to heat to the point of boiling. Then, quickly, the can is removed from the heat, turned upside down and lowered into cold water. As a result, the heat inside the can and the cold water meeting it cause the outside (room) pressure to crush the can - is any of the science involved in this experiment relevant? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3317 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 9:49 pm: |      |
This reminds me of an experiment in which a small amount of water is put into a metal soda can, then the can is placed over a flame, allowing the water inside to heat to the point of boiling. Then, quickly, the can is removed from the heat, turned upside down and lowered into cold water. As a result, the heat inside the can and the cold water meeting it cause the outside (room) pressure to crush the can - is any of the science involved in this experiment relevant? Gas, pressure, heat, and the inertia of a liquid are all relevant. Vacuum and condensation are not relevant. |
Balin (Balin)
New member Username: Balin
Post Number: 5866 Registered: 4-2010
| | Posted on Tuesday, October 05, 2010 - 9:51 pm: |      |
Is the liquid boiled? In the metal thing? A pan? Or pot? Is the object conical? Cylindrical? Spherical? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3319 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 9:55 pm: |      |
Is the liquid boiled? No. In the metal thing? Yes. A pan? Or pot? Is the object conical? Cylindrical? Spherical? Conical with a flat bottom. It's a one liter kitchen measuring cup made from stainless steel. |
Balin (Balin)
New member Username: Balin
Post Number: 5871 Registered: 4-2010
| | Posted on Tuesday, October 05, 2010 - 9:57 pm: |      |
Because of the breakage, does the 1-liter cup now only hold 9/10 of a liter? Does the top of the cup break? Is the liquid in the cup for a long time? Is the liquid especially hot? Cold? Frozen? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3320 Registered: 9-2009
| | Posted on Tuesday, October 05, 2010 - 10:13 pm: |      |
Because of the breakage, does the 1-liter cup now only hold 9/10 of a liter? Indeed. Does the top of the cup break? No. Is the liquid in the cup for a long time? No. Is the liquid especially hot? No, not the liquid but... Cold? Frozen? |
Balin (Balin)
New member Username: Balin
Post Number: 5875 Registered: 4-2010
| | Posted on Wednesday, October 06, 2010 - 1:02 am: |      |
Is the cup especially hot? Is there now a hole in the cup? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3324 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 8:00 am: |      |
Is the cup especially hot? No. Is there now a hole in the cup? Assume no. |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3327 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 8:22 am: |      |
Hint: find out what produced the force necessary to damage the steel cup. |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 474 Registered: 6-2005
| | Posted on Wednesday, October 06, 2010 - 9:51 am: |      |
Damn, I'm working with pressure, temperature, vacuum and condensation the whole day (working on some sterilization measurements...) and now I have to cope with them also on LTPF! :-P So let me try a short recap, which should make things clearer at least for me... We have a 1-liter metal cup, which is used to hold an unidentified liquid. As a result of this operation, the cup is damaged, and at the end of the story its volume is reduced to 0,9 litres. All correct? Is the cup damaged because of: a pressure? a force? an abrupt temperature change? a phase change of the substance which it holds? Any corrosive substances relevant? Is the liquid substance poured into the cup? Or is the cup "drowned" into the liquid? Whenever the cup and the liquid are in contact, is the liquid temperature very high? Above 100°C? 200°C? More? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3331 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 10:34 am: |      |
Damn, I'm working with pressure, temperature, vacuum and condensation the whole day (working on some sterilization measurements...) and now I have to cope with them also on LTPF! :-P To me, they are more of a hobby (especially the pressure and temperature part), so I have nothing against them ;) So let me try a short recap, which should make things clearer at least for me... We have a 1-liter metal cup, which is used to hold an unidentified liquid. Correct, though a crucial detail is missing here. As a result of this operation, Not as a result of holding the liquid, explore the cup is damaged, and at the end of the story its volume is reduced to 0,9 litres. All correct? Correct. Is the cup damaged because of: a pressure? a force? an abrupt temperature change? a phase change of the substance which it holds? Pressure, force, abrupt temperature and phase change are all involved. Any corrosive substances relevant? No. Is the liquid substance poured into the cup? This. Or is the cup "drowned" into the liquid? Whenever the cup and the liquid are in contact, is the liquid temperature very high? Above 100°C? 200°C? More? The liquid is on fire, which is peripherally relevant. But the same thing would've happened to the cup, had the liquid been cold water. |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 476 Registered: 6-2005
| | Posted on Wednesday, October 06, 2010 - 10:44 am: |      |
The crucial missing detail, does it concern: the nature of the substance? (Is is some alcoholic substance btw?) Its physical phase? The way is it poured into the cup? How much time is it held into the cup? Or is there any other object or substance relevant here? The involved phase change: liquid -> gaseous? gaseous -> liquid? other? Is the cup covered and sealed in any way and at any moment? (I cannot imagine a pressure change otherwise...) Is the cup damaged: as soon as the liquid is poured? After a certain time, but while still holding the liquid? After the liquid has been removed from it? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3332 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 10:54 am: |      |
The crucial missing detail, does it concern: the nature of the substance? Not the substance, see below. (Is is some alcoholic substance btw?) Yes, it's denatured ethanol. Its physical phase? The way is it poured into the cup? How much time is it held into the cup? Or is there any other object or substance relevant here? Yes indeed. The involved phase change: liquid -> gaseous? gaseous -> liquid? other? This. Is the cup covered and sealed in any way and at any moment? No. (I cannot imagine a pressure change otherwise...) Remember Newton. Is the cup damaged: as soon as the liquid is poured? After a certain time, but while still holding the liquid? After the liquid has been removed from it? It's damaged in the process of removing the liquid. |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 477 Registered: 6-2005
| | Posted on Wednesday, October 06, 2010 - 12:47 pm: |      |
Is there another object involved? Another substance? Solid, liquid, gaseous? What is relevant about this other object/substance? Its nature (if it is a substance)? Its material (if it is an object)? Its temperature? Weight? Volume? Is it mixed/poured/drowned in the denatured ethanol while in the cup? Wild guess, are you using ethanol to clean something? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3333 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 12:55 pm: |      |
Is there another object involved? Yes. Another substance? This also. Solid, This. liquid, gaseous? Eventually. What is relevant about this other object/substance? Its nature (if it is a substance)? This. Its material (if it is an object)? It's better to figure out the substance. Its temperature? Something temperature-related happens to it. Weight? Volume? Is it mixed/poured/drowned in the denatured ethanol while in the cup? No. Wild guess, are you using ethanol to clean something? No. |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 478 Registered: 6-2005
| | Posted on Wednesday, October 06, 2010 - 12:58 pm: |      |
Is it a metal? a plastic? a powder? Chemical reactions involved? Is this substance in contact with the ethanol at any moment? Is it in contact with the cup at any moment? |
Balin (Balin)
New member Username: Balin
Post Number: 5900 Registered: 4-2010
| | Posted on Wednesday, October 06, 2010 - 1:05 pm: |      |
Other substance: dry ice? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3334 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 1:12 pm: |      |
Is it a metal? a plastic? a powder? This. Chemical reactions involved? Yes. Is this substance in contact with the ethanol at any moment? Yes. Is it in contact with the cup at any moment? Yes. Other substance: dry ice? No. |
Balin (Balin)
New member Username: Balin
Post Number: 5905 Registered: 4-2010
| | Posted on Wednesday, October 06, 2010 - 1:19 pm: |      |
Is the substance intended to cause a reaction? With the ethanol? Is the ethanol set on fire? Is anything set on fire? Does the ethanol explode? Is the powder edible? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3337 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 1:24 pm: |      |
Is the substance intended to cause a reaction? Yes. With the ethanol? No. Is the ethanol set on fire? Yes. Is anything set on fire? Yes. Does the ethanol explode? Yesish. Is the powder edible? No. |
Balin (Balin)
New member Username: Balin
Post Number: 5908 Registered: 4-2010
| | Posted on Wednesday, October 06, 2010 - 1:29 pm: |      |
Is the fire what breaks the measuring cup? Is the substance intended to react with the metal cup? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3340 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 1:34 pm: |      |
Is the fire what breaks the measuring cup? The ethanol fire does not, but... Is the substance intended to react with the metal cup? No. |
Balin (Balin)
New member Username: Balin
Post Number: 5911 Registered: 4-2010
| | Posted on Wednesday, October 06, 2010 - 1:35 pm: |      |
Does something else catch on fire? The powder? Is the powder a ground-up metal? |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 479 Registered: 6-2005
| | Posted on Wednesday, October 06, 2010 - 1:39 pm: |      |
So is there another relevant substance which is intended to react with the powder? Does the reaction take place inside the cup? While the cup is filled with ethanol? Does this reaction generate a force which damages the cup? Is the force due to a sudden pressure increase, which is in turn due to a phase change caused by the chemical reaction? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3343 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 1:47 pm: |      |
Does something else catch on fire? The powder? Yes to both. Is the powder a ground-up metal? No. So is there another relevant substance which is intended to react with the powder? No, the powder reacts with itself. Does the reaction take place inside the cup? While the cup is filled with ethanol? yes to both. Does this reaction generate a force which damages the cup? Is the force due to a sudden pressure increase, which is in turn due to a phase change caused by the chemical reaction? Yes to all! Getting close now. |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 480 Registered: 6-2005
| | Posted on Wednesday, October 06, 2010 - 2:08 pm: |      |
Is the reaction simply caused by the fact that the powder temperature increases? If so, the on-fire ethanol has the only function to heat up the powder? Does the powder undergo a solid-gaseous phase change (a sort of explosion)? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3348 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 2:18 pm: |      |
Is the reaction simply caused by the fact that the powder temperature increases? Yes. If so, the on-fire ethanol has the only function to heat up the powder? No. Does the powder undergo a solid-gaseous phase change (a sort of explosion)? Yes, it explodes violently. Still to find out: what happened exactly, and what was I trying to accomplish by that? (It was a success by the way, except for the damage to the measuring cup.) |
Balin (Balin)
New member Username: Balin
Post Number: 5922 Registered: 4-2010
| | Posted on Wednesday, October 06, 2010 - 4:25 pm: |      |
Were you trying to pull a MythBusters and just blow something up? Or were you planning to do something with the powder and ethanol later? Were you trying to increase fuel efficiency in something? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3358 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 4:37 pm: |      |
Were you trying to pull a MythBusters and just blow something up? No, but OTRT. I did not plan on damaging anything, though I knew there was a possibility. Mythbusters have done stuff very similar to this. Or were you planning to do something with the powder and ethanol later? No. Were you trying to increase fuel efficiency in something? No. |
Balin (Balin)
New member Username: Balin
Post Number: 5936 Registered: 4-2010
| | Posted on Wednesday, October 06, 2010 - 11:17 pm: |      |
Were you trying to create something with the powder and ethanol? Did you expect the explosion? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3365 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 11:31 pm: |      |
Were you trying to create something with the powder and ethanol? Did you expect the explosion? Yes to both. |
Balin (Balin)
New member Username: Balin
Post Number: 5947 Registered: 4-2010
| | Posted on Wednesday, October 06, 2010 - 11:34 pm: |      |
Is the powder typically flammable? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3367 Registered: 9-2009
| | Posted on Wednesday, October 06, 2010 - 11:49 pm: |      |
Is the powder typically flammable? Yes. |
Balin (Balin)
New member Username: Balin
Post Number: 5956 Registered: 4-2010
| | Posted on Wednesday, October 06, 2010 - 11:57 pm: |      |
Is it phosphorus? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3370 Registered: 9-2009
| | Posted on Thursday, October 07, 2010 - 12:01 am: |      |
No. It's powerful black powder. |
Balin (Balin)
New member Username: Balin
Post Number: 5967 Registered: 4-2010
| | Posted on Thursday, October 07, 2010 - 12:18 am: |      |
Gunpowder? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3371 Registered: 9-2009
| | Posted on Thursday, October 07, 2010 - 7:54 am: |      |
Gunpowder? Yes. Now what could I hope to accomplish by setting of an explosive charge in a cup of burning ethanol? |
Balin (Balin)
New member Username: Balin
Post Number: 6035 Registered: 4-2010
| | Posted on Thursday, October 07, 2010 - 12:19 pm: |      |
Were you trying to accomplish something related to an engine? Were you trying to build an engine? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3383 Registered: 9-2009
| | Posted on Thursday, October 07, 2010 - 1:00 pm: |      |
Were you trying to accomplish something related to an engine? Were you trying to build an engine? No to both. Simpler. |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 482 Registered: 6-2005
| | Posted on Thursday, October 07, 2010 - 1:04 pm: |      |
Were you doing something related to your job? To a hobby of yours? Just for fun? Did you want to obtain a final product (ex. "modified ethanol"), or a final "condition" (ex. broken cup :-P)? Was your objective related to: the gunpowder? The ethanol? The cup? Something else? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3385 Registered: 9-2009
| | Posted on Thursday, October 07, 2010 - 1:33 pm: |      |
Were you doing something related to your job? To a hobby of yours? This. Just for fun? this too. Did you want to obtain a final product (ex. "modified ethanol"), or a final "condition" (ex. broken cup :-P)? I wanted (and succeeded) in obtaining a temporary "condition" (there's a better word for it though). Was your objective related to: the gunpowder? The ethanol? This, mainly. The powder and the cup were tools. The cup? Something else? Hint: often, gasoline is used instead of ethanol. |
Balin (Balin)
New member Username: Balin
Post Number: 6044 Registered: 4-2010
| | Posted on Thursday, October 07, 2010 - 3:40 pm: |      |
Were you trying to create an explosive? Fireworks? |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3391 Registered: 9-2009
| | Posted on Thursday, October 07, 2010 - 4:04 pm: |      |
Were you trying to create an explosive? Fireworks? close enough. ***SPOILER*** I am a hobby pyrotecnician, and I'm planning on doing a small show at the yearly skydiving club party. One thing I want to do is launch colored liquid fireballs, using methanol and different flame coloring salts. I had tested a few two deciliter ones, but wanted to make a bigger one. A skydiving friend suggested I use a conical mortar, so as to better launch the fuel into the air. So I put a black powder charge in the bottom of the measuring cup, and put some duct tape in between to protect it. For safety, I went to an abandoned beach and buried deep in the sand, before filling it with ethanol (no reason to waste methanol on a test), lighting it and the fuse, and running. KABOOM! A great fireball emanated from the sand, and the blast echoed around the lake for several seconds. It was awesome. Unfortunately for the measuring cup, it being conical meant that the equal and opposite force pushed the walls straight downwards. The bottom deciliter of the cup crumpled, and the flat bottom got bent. Cue maniacal laughter when I discovered the state of the cup... It's now a deciliter shorter, and I keep it as a trophy/reminder. If I do end up launching fireballs at the party, they will either be smaller, or launched from sturdy, cylindrical tubes where the force of the launch will be more evenly spread instead of all concentrated in a small area. |
Balin (Balin)
New member Username: Balin
Post Number: 6051 Registered: 4-2010
| | Posted on Thursday, October 07, 2010 - 4:06 pm: |      |
Man...that sounds like fun. I'm jealous. |
Ixoye724 (Ixoye724)
New member Username: Ixoye724
Post Number: 2782 Registered: 1-2001
| | Posted on Thursday, October 07, 2010 - 4:11 pm: |      |
Cool puzzle, very educational, and I recommend that further testing of this be done at aforementioned abandoned beach as opposed to the vicinity of any area frequented by humans (except yourself, of course). |
Kayleetonkslupin (Kayleetonkslupin)
New member Username: Kayleetonkslupin
Post Number: 472 Registered: 9-2010
| | Posted on Thursday, October 07, 2010 - 4:14 pm: |      |
I feel sorry for the poor measuring cup... |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3393 Registered: 9-2009
| | Posted on Thursday, October 07, 2010 - 4:25 pm: |      |
Indeed so. The only way to be able to keep doing my hobby in the long run, is to keep it low key and not disturb or annoy people. I hope to eventually be able to get a manufacturing license, and start making some serious stuff. This is my best homemade piece so far: http://www.youtube.com/watch?v=23fPOfrMTMU |
Balin (Balin)
New member Username: Balin
Post Number: 6059 Registered: 4-2010
| | Posted on Thursday, October 07, 2010 - 4:30 pm: |      |
Wow...now I'm even more jealous. |
Mattiel (Mattiel)
New member Username: Mattiel
Post Number: 484 Registered: 6-2005
| | Posted on Friday, October 08, 2010 - 8:44 am: |      |
Wow! Nice job, and nice puzzle! |
Galfisk (Galfisk)
New member Username: Galfisk
Post Number: 3428 Registered: 9-2009
| | Posted on Friday, October 08, 2010 - 6:05 pm: |      |
Thanks everyone. Exhibit A: http://pyrobin.com/files/dscf2656.jpg (big image) |