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vago is confusing, as he knows just enough to confuse, but not enough to explain.
if we take water, and put it in a container. Then we remove all the air one way or the other.
If we know the temperature, we know the pressure. Optionally, if we know the pressure, we know the temperature.
This is true for many liquids in specific ranges - freon comes to mind. with two pressure gauges, you can see the different pressures on an AC unit.
What gets confusing is what happens when there are other substances in the mix.
and, to further confuse it, the temperature/pressure thing ONLY works within a narrow band for each substance, or the gasses start acting like ideal gasses, only there are lots of exceptions.
again, vago is pretty good about finding problems with stupid little things..... but he isn't quite good enough to actually do the math to find opportunities for improvement.
and the BIG issue you have circled around, which vago doesn't want to discuss, is the fact steam really DOES act like an ideal gas, until the temp drops to 600ish.
from there, no one is exactly sure what happens - does the steam maintain pressures as the volume increases as the piston goes down????
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