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Let's say we have 2 closed cylinders A and B, same volume, containing air inside. Two cylinders are connected to each other with a tube, with valve. Initially the valve is closed.

cylinder A: P=100 Pa, T= 350 k.

cylinder B: P=50 Pa, T= 300 k

now if the valve is opened, and closed when their pressure are the same.

assume no heat loss to or gain from surrounding.

here my problem:

will their temperature be the same when their reach the same pressure?

my guess are....

1. yes. By ideal gas law, PV/T = mR, if P1=P2, V1=V2, then T1=T2, so the temp will be the same.

2. no. When the valve is opened, the air flows from A to B, which means the air does some flow work. By conservation of energy, the temp in B will be higher than A.

which one of me should I believe??

thanks.

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# Homework Help: Gas flows from cylinder A to cylinder B

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