2006-08-12 07:45:50 · 12 answers · asked by Anonymous in Computers & Internet ➔ Other - Computers
Best Answer - from previous post for similar ?
The can gets cold for the same reason that any other refrigeration unit gets cold. (eg air conditioner, refrigerator, dehumidifier). Inside of the can, there is a chemical which can be used as a refrigerant. It's a chemical with a low vapor pressure. When you press the button on top of the can, you open a valve and release some of the pressure from the can. Because this chemical has a high vapor pressure, it evaporates when the pressure drops. The process of evaporation requires intermolecular bonds in the liquid to be broken. In order to break the bonds, energy must be expended. The energy that goes into breaking bonds comes from the ambient thermal energy. As the amount of available thermal energy decreases, the liquid refrigerant becomes cold (its temperature decreases). If you hold the trigger down long enough, the can will become very cold and the evaporation process will slow down and you will notice that the can doesn't work very well anymore as a duster because not much air is coming out. If you add thermal energy to the refrigerant by running hot water over the cold can, you will HEAR and feel the refrigerant boiling inside of the can....the pressure inside of the can increases again to a point where evaporation stops and then you are ready to use your compressed air can again.
2006-08-12 07:55:28 · answer #1 · answered by janet 3 · 5⤊ 0⤋
Compressed Air Spray
2016-12-31 04:29:05 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Air Spray Can
2016-11-10 02:12:58 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Any time you compress a gas, it gets hotter. When you release the pressure, it gets cooler. This is basically how air conditioners and refrigerators work.
2006-08-12 07:51:43 · answer #4 · answered by Anonymous · 0⤊ 2⤋
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gas cools down if it expands suddenly. similar principle is used in AC and refrigerators.
2016-04-07 00:47:49 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Pressure = Volume / Temperature
When you press the sprayer, the pressure decreases. This volume required to contain the gas is increased, and the temperature decreases.
2006-08-12 07:52:55 · answer #6 · answered by © 2007. Sammy Z. 6 · 0⤊ 2⤋
The why when I fart is the air warm?
2016-01-26 07:04:13 · answer #7 · answered by gcnengineer 3 · 0⤊ 0⤋
I was wondering much the same thing
2016-08-23 04:11:45 · answer #8 · answered by ? 4 · 0⤊ 0⤋
Would like to know more about this too
2016-08-08 09:11:14 · answer #9 · answered by Anonymous · 0⤊ 0⤋
expanding gases consume heat
2006-08-12 07:48:09 · answer #10 · answered by Anonymous · 1⤊ 1⤋