2006-10-07 05:03:51 · 10 answers · asked by chris_sheldrick67 1 in Science & Mathematics ➔ Chemistry
Lots of them, actually. The expansion and subsequent cooling of a gas is called the Joule-Thomson effect. If the cooling is large enough, you can get either condensation of the gas itself or of the moisture in the air during the expansion.
Since the expanded gas is rapidly warmed by the atmosphere, the "cloud" is very temporary. This effect works very well with pressurized nitrogen, air, carbon dioxide, freonm etc,
Military systems use expansion of 6000 psi nitrogen to get liquid nitrogen for cooling infrared detectors, and are able to achieve a temperature change from above 330 kelvins to nearly 77 kelvins.
2006-10-07 05:13:05 · answer #1 · answered by arbiter007 6 · 1⤊ 0⤋
Carbon Dioxide (CO2) - -as used in portable fire extinguishers - when discharged, it appears as a white cloud of gas - making it easy tp direct at fire source - extinguishes fire by starving it of oxygen, and to some extent has a cooling effect, as the gas is cold.
2006-10-07 05:15:02 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Bromine
2006-10-07 05:26:45 · answer #3 · answered by adad 2 · 1⤊ 0⤋
Butane
2006-10-07 05:13:06 · answer #4 · answered by ? 6 · 0⤊ 0⤋
ammonium compounds let off this form of discharge. Hence, it is probable that the gases concerned are nitrogen based.
2006-10-07 05:22:05 · answer #5 · answered by cookie 3 · 0⤊ 0⤋
Carbon Dioxide is the obvious one. But only at high pressure.( e.g. fire extinguihers). Chlorine is another one ( green gas).
2006-10-07 05:13:18 · answer #6 · answered by singing_saagar 2 · 0⤊ 0⤋
Hydrogen chloride unless the air is very,very dry.
2006-10-07 09:16:06 · answer #7 · answered by Anonymous · 0⤊ 0⤋
arbiter00 is the right answer and obviously a German Worker.
2006-10-07 05:17:10 · answer #8 · answered by Anonymous · 0⤊ 0⤋
CO2
2006-10-07 05:11:52 · answer #9 · answered by Helmut 7 · 0⤊ 0⤋
ammonia
2006-10-07 05:09:07 · answer #10 · answered by Cobra 5 · 0⤊ 0⤋