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Ol' CW..... your conversion math is correct. And water, with a Specific Gravity of '1', is a convenient substance on which to reference pressures and depressions. It is more sensitive, in an observable fashion, in a manometer for instance, than mercury would be. Racing fuel, with a specific gravity near .720, would be slightly more sensitive than water, however......... we can see it now........ "There I was, reading my manometer with Sunoco 110 in it, and the darned thing blew up and caught on fire!!" Not a good thing! -Dave-
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