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inch: see English units of measurement English units of measurement, principal system of weights and measures used in a few nations, the only major industrial one being the United States. It actually consists of two related systems—the U.S. ..... Click the link for more information. . inchUnit of measure equal to 1/36 yard and since 1959 defined officially as 2.54 cm (see metre). David I of Scotland (c. 1150) defined the inch as the breadth of a man's thumb at the base of the nail; usually the thumb breadths of three men—one small, one medium, and one large—were added and then divided by three. During the reign of England's Edward II, the inch was defined as “three grains of barley, dry and round, placed end to end lengthwise.” At various times it has also been defined as the combined lengths of 12 poppy seeds. See also foot; International System of Units; measurement; metric system. inch 1. a unit of length equal to one twelfth of a foot or 0.0254 metre 2. Meteorol a. an amount of precipitation that would cover a surface with water one inch deep b. a unit of pressure equal to a mercury column one inch high in a barometer inch [inch] (mechanics) A unit of length in common use in the United States and Great Britain, equal to ยน⁄₁₂ foot or 2.54 centimeters. Abbreviated in. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Pulling a wide range, such as 25-28 inches of mercury, will be detrimental to achieving a reliable reading. As applied to natural gas, the volume of gas which, when saturated with water vapor at 60 degrees F and at a pressure of 30 inches of mercury occupies one cubic foot of volume. This can introduce unadjusted testing errors of more than two inches of mercury in the actual vacuum level and vary measured specified gravities in the test samples by as much as 0. |
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