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Wandering_Uncertainty , 4 months ago Because in^2 is generally said “square inches.” So it’s “pounds per square inch.” Sometimes “per” will get its own letter, like in PPM - parts per million - and sometimes it’s left off, as in PSI.
Because in^2 is generally said “square inches.”
So it’s “pounds per square inch.”
Sometimes “per” will get its own letter, like in PPM - parts per million - and sometimes it’s left off, as in PSI.