In article , Ned Simmons
says...

The gas regulator does not get hot.

Well, he's correct in the observation that the regulator
does not get hot, not in the conclusion he draws from that
fact--that there is thus no loss in the regulator.

The 'loss' is not in the regulator. It's inherent
in the process of expanding the gas into the second
tank. The same thing happens with no regulator at
all, if you simply connect the two tanks together.

Jim

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