W


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W,

23d letter of the alphabetalphabet
[Gr. alpha-beta, like Eng. ABC], system of writing, theoretically having a one-for-one relation between character (or letter) and phoneme (see phonetics). Few alphabets have achieved the ideal exactness.
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, in form a doubled u or v. It is the usual symbol of a voiced bilabial semivowel, as in the English wing. The same semivowel occurs as second member of the dipthongs au (as in house), ō, and o͞o. In twice the w represents a voiceless semivowel, which is heard also in some dialects that distinguish between where and wear. In chemistry W is the symbol for the element tungstentungsten
[Swed.,=heavy stone], metallic chemical element; symbol W; at. no. 74; at. wt. 183.84; m.p. about 3,410°C;; b.p. 5,660°C;; sp. gr. 19.3 at 20°C;; valence +2, +3, +4, +5, or +6.
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W

(chemistry)
(physics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

W

1. Abbr. for watt.
2. On drawings, abbr. for “west.”
3. On drawings, abbr. for “width.”
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

watt

The standard unit of measurement of electrical power. In a direct current (DC) circuit, one watt is one ampere of current flowing at one volt. In an alternating current (AC) circuit, watt ratings are a calculation of how the circuit reacts to the AC source. See volt-amps and RMS.
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