[ChrisV]

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How do you plan to pressurise the gas? You can do it by decreasing volume, in which case the temperature will not increase...

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Try putting your thumb over the end of a bicycle pump, quickly decrease the volume (push the pump), and see whether the temperature of the air against your thumb has increase.

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I am aware that applying pressure to a gas causes its temperature to increase. What I'm saying is that there is no particular reason that a gas at high pressure has to have a higher temperature. Here again is Matt R's original statement:

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Think of a canister under high pressure. A gas under high pressure is at a higher internal temperature than one under low pressure, and thus the particles have a higher kinetic energy.

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"A gas at high pressure is at a higher temperature" is false and is not the same statement as "applying pressure to a gas causes its temperature to increase".