2006-07-21 04:57:27 · 9 answers · asked by coop dog 1 in Science & Mathematics ➔ Physics
The laws of Boyle or Charles are not useful here because neither pressure nor volume nor temperature is constant.
What counts is that the total heat in the air remains constant because it expands so fast that no significant heat flow occurs. (It is an adiabatic process.)
For adiabatic processes the precise relationship depends on the type of gas, but in general the adiabatic lowering of pressure (which goes with an increase in volume) will decrease the temperature.
2006-07-21 05:30:34 · answer #1 · answered by dutch_prof 4 · 0⤊ 0⤋
When the can is pressurized it heats up. (Boyle's law and Charles law). It gives off that heat to the surrounding air during the time between its being filled and your using it.
When you use it it takes back that heat from its surroundings. Since it cooled down while under pressure, it returns to its original temperature minus the heat that it radiated.
Refrigerators and air conditioners work on the same principle.
You pressurize a gas, let it throw of the heat generated, then unpressurized it inside (either the refrigerator or the house). When it depressurizes, it is cooler than it was due to the heat thrown off, so it absorbs heat from its surroundings.
2006-07-21 12:09:25 · answer #2 · answered by rt11guru 6 · 0⤊ 0⤋
I just love these answers!
First off, its because the "freon" inside the can which forces the air out grows cold as the air "volume" drops inside the can, having to work to push the less dense air volume out! Never noticed it gets WORSE the lower the air pressure gets?
The same way it works in your car!
2006-07-21 12:46:33 · answer #3 · answered by AdamKadmon 7 · 0⤊ 0⤋
Expansion of the compressed air remaining in the can due to your release of some of it. Google Charles's law (or gas laws, to learn about the relationships of temperature, volume and pressure) and find out all about it. This is pretty much unrelated to refrigeration, which derives most of its effect from the state change of the refrigerant (liquid to gas). Your air can contains nothing but a gas.
2006-07-21 12:12:36 · answer #4 · answered by kirchwey 7 · 0⤊ 0⤋
when air or gas is released from a pressurized container the compress air gets expanded and in the process it cools the container. V= M/P
2006-07-21 12:50:12 · answer #5 · answered by mukesh padhya 3 · 0⤊ 0⤋
When a liquids evaporates, the molecules that evaporate take energy from the system ans the rest of the liquid cools down. That is the reason why we sweat, to cool us through evaporation. In your cann the air (or deo or whatever) is liquid because it was closed at high pressure. When you used you let some of this liquid to evaporate and it goes out, The rest cools down.
2006-07-21 12:09:01 · answer #6 · answered by Andres 5 · 0⤊ 0⤋
Which one was it Chalres Law or Boyles Law. I think Charles. Increase pressure, increase temperature. So, the opposite is true. Decrease pressure, by letting the compressed air out, decrease temperature.
2006-07-21 12:15:25 · answer #7 · answered by quntmphys238 6 · 0⤊ 0⤋
Expanding gas cools as stated in Charles law. This is why you cna sit in an air conditioned room and ask silly questions.
2006-07-21 12:32:21 · answer #8 · answered by Jeffrey S 6 · 0⤊ 0⤋
Let me get this straight. You have a can of dehydrated water?
2006-07-21 12:04:46 · answer #9 · answered by Anonymous · 0⤊ 1⤋