Tom Veatch wrote:

But the question was which one would contain the most water "vapor".
So state change has to be considered.

Use the general energy equation to develop the specific equation for
the conditions at hand.

It all drops out to yield pounds is pounds. Vapor, liquid, gas, who
cares, it is still weight (Mass if you prefer).

The whole thread got started in answer to a question about where to
locate a dryer in a compressed air system.

My smart ass response was "Where the water is" or something close,
thus on the high pressure, not the low pressure side of the compressor.

I stand by that statement.

Lew