How does temperature affect pressure?

[BgdPassat]

I was just wondering what effect, if any, ambient temp. had on bag/tank pressure. I was told by an install guy that it' s normal to see fluctuation in pressure over night because it gets cold and air expands (or contracts?) Is this true? Has anybody experienced this phenomenon?

[dj_pizzim]

yes air molecules expand when heated thats why you have to add air to your tires in the winter but i dont know if it effects the bags

[darren@ridetech.com]

Theoretically speaking, yes. Realistically, no. If you were to see a 30 deg. drop overnight it might drop 3 psi. If you are losing 10 psi or more overnight you probably have a leak.