mega_swordman wrote:For Chaos, Spudthug is partially right. Compressing a gas (in our case, propane) in a closed container raises the temperature. However, an interesting point I also read is the fact that propane, when over 100C remains in a gaseous form. So, whether you achieve enough pressure to raise the temperature can only be tested.
You're forgetting that you are not compressing propane when you get it out of the cylinder... It is turning from liquid to gas and expanding - in fact cooling down.
If you started with a load of gaseous propane and then squashed it you would raise its temperature.
To get propane from a cylinder to over room temperature you would have to heat it.