Quick, easy question for a physical chemist. When a gas is allowed to expand adiabatically and reversably, does the temperature increase or decrease with the drop in pressure? Or does it depend on the nature of the gas?
2007-06-21 14:34:44 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Adiabatic means no heat enters or leaves the system, so expanding the gas without adding heat will cause a drop in temperature.
It is a little easier to see the opposite in real life. When you use a bycicle pump to pump up something fairly large (like a car tire) the pump will get quite warm from the compression of the air.
2007-06-21 14:42:42 · answer #1 · answered by Flying Dragon 7 · 1⤊ 0⤋
When you increase the pressure and compress the molecules they start to move faster and that raises the temperature. The gas from is compressible, it will not keep the same volume as it is compressed. If the pressure stay the same the volume stay the same. You are not paying attention in class. If you have a air compressor with tank, and you turn it on after it is run a while, you can not touch the air line to tank as it will burn your hand, turn off the compress and check the pressure. Come back in the morning and you can touch the compressor all over, it will be cool, recheck the tank pressure , and it will be the same as it was the night before. You draw the conclusion.
2016-05-17 06:51:15 · answer #2 · answered by Anonymous · 0⤊ 0⤋