[Mikez]

my teachers says that pressure in a can (assume no volume change) in  a freezer stays the same but how does that make sense?

I thought that K energy proprotional to temperature so if temp goes down then K energy goes down, then since P=F/A and A stays the same then P must go down?

am I missing something?

thanks

[ARGOS++]

Dear Mikez;

You are not missing something.

You can make the proof by using the ideal gas law:  pV = nRT (see on Wiki).
Rearrange it for p and keep all constant except the temperature!

Good Luck!
                    ARGOS⁺⁺

[Mikez]

thanks,

but I've also noticed that a lot of teachers tend to say that a closed system like a can will always have the same pressure, I don't understand why that would be true?

[ARGOS++]

Dear Mikez;

The whole ideal gas law:  pV = nRT itself is a closed system, but not a can, which can communicate with the environment at least by the temperature.

Good Luck!
                    ARGOS⁺⁺