Beaufort scale

   an empirical scale, first devised by the British admiral Sir Francis Beaufort (1774-1857), for estimating wind speed by observing the effects of the wind. Using the scale, sailors can judge the wind velocity by observing the wind's effects on the waves. There is a corresponding scale for observers on land. For example, a moderate gale (32-38 miles per hour) is described as "force 7" on the Beaufort scale. The Beaufort scale numbers come rather close to being a unit of measurement, because they are equal to the whole number closest to 0.66 times the wind velocity in miles per hour raised to the exponent 2/3 (Beaufort force = 0.66 x (velocity2/3)).

Dictionary of units of measurement. 2015.

Look at other dictionaries:

  • Beaufort scale — [bō′fərt] n. [after Sir Francis Beaufort (1774 1857), Brit naval officer who devised the original scale (1806)] a scale of wind force and speed: see the Reference Supplement …   English World dictionary

  • Beaufort scale — ► NOUN ▪ a scale of wind speed ranging from force 0 to force 12. ORIGIN named after the English admiral Sir Francis Beaufort (1774 1857) …   English terms dictionary

  • Beaufort scale — to measure wind velocity, developed 1806 by Francis Beaufort (1774 1857), surveyor and hydrologist …   Etymology dictionary

  • Beaufort scale — Force 12 at sea. The Beaufort Scale (  / …   Wikipedia

  • Beaufort scale — /boh feuhrt/, (no longer in technical use) 1. a scale of wind forces, described by name and range of velocity, and classified as from force 0 to force 12, or, sometimes, to force 17. 2. a scale of the states of sea created by winds of these… …   Universalium

  • Beaufort scale — A set of descriptive terms of wind strength, evolved according to the effect of wind upon sailing craft and sea disturbance. Captain Beaufort devised the scale in 1806. The scale is depicted in the illustration. (See page 102) …   Aviation dictionary

  • Beaufort scale — Beau′fort scale′ [[t]ˈboʊ fərt[/t]] n. mer a scale for indicating the force or speed of wind, using numbers from 0 to 12 or sometimes 17 • Etymology: 1855–60; after Sir Francis Beaufort (1774–1857) …   From formal English to slang

  • Beaufort scale — noun Etymology: Sir Francis Beaufort Date: 1858 a scale in which the force of the wind is indicated by numbers from 0 to 12 …   New Collegiate Dictionary

  • Beaufort scale — noun An empirical measure for the intensity of the wind based mainly on the state of the sea or wave conditions. Syn: Beaufort wind force scale …   Wiktionary

  • Beaufort scale — [ bəʊfət] noun a scale of wind speed ranging from 0 (calm) to 12 (hurricane). Origin C19: named after Sir Francis Beaufort, the English admiral who devised it …   English new terms dictionary

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