plural of proof spirit

an economic law that claims a good must sell for the same price in all locations

(physics, meteorology) Synonym of gauge pressure

(physics, meteorology) The absolute pressure minus the atmospheric pressure.

(politics, derogatory) An attempt to influence public policy through press releases intended to alarm the public into demanding action from their elected officials.

(aviation) A measure of altitude inferred by the measurement of ambient pressure in differential with a reference pressure at a known altitude.

(aviation) A device which measures the altitude by performing measurement of the ambient pressure and comparing it against a reference pressure at a known altitude, to give a pressure altitude.

(electricity) voltage

Supporting or favoring black people.

(aviation, travel) an official form to be filled out if checked baggage is lost or damaged by an airline.