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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site boiler pressure The pressure of the steam or water in a boiler as measured; it is expressed in pounds per square inch gauge (psig). Related category    • BOILERS Also on this site: Encyclopedia of Science Encyclopedia of History BACK TO TOP