That's what I was referring to as "open system" where the steam is released as a total loss to atmosphere. The force is relative to the pressure differential between inside the cylinder and the outside atmosphere.
I "think" what PSIA is a measurement of is a return system operated under a vacuum, as a closed system where the spent steam is condensed and returned through the system via vacuum.
This is seen more on steam turbines which require more pure and treated water, and ships where fresh water has to be distilled, and cannot be processed fast enough for total loss system.
PSIA is another system of measuring pressure relative to vacuum instead of PSIG which is relative to whatever atmosphere is available.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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