Glossary - V Vapor pressure.   The portion of atmospheric pressure that is exerted by the moisture in the air (expressed in tenths of an inch of mercury). Volt.   The basic unit of electrical potential or electromotive force. A potential of one volt appears across a resistance of one ohm when a current of one ampere flows through that resistance.v Voltmeter.   A current-measuring instrument, designed to indicate voltage by measuring the current flow through a resistance of known value. Volume.   The amount of space within a three-dimensional solid.

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