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scale, in weights and measures

(Encyclopedia)scale, in weights and measures, instruments for determining weight, generally for other than laboratory use. For the principles of operation of all weighing devices, see balance. Platform scales utili...

San Jose scale

(Encyclopedia)San Jose scale, common name for a scale insect, Aspidiotus perniciosus, introduced from China into San Jose, Calif., c.1870 on nursery stock. The insect has since spread throughout much of the United ...

key, in music

(Encyclopedia)key. 1 In music, term used to indicate the scale from which the tonal material of a given composition is derived. To say, for example, that a composition is in the key of C major means that it uses as...

tonic

(Encyclopedia)tonic, in music: see harmony; key; scale; tonality. ...

Friedrich, Caspar David

(Encyclopedia)Friedrich, Caspar David käsˈpär däˈfēt frēˈdrĭkh [key], 1774–1840, German romantic landscape painter. After studying painting in Copenhagen he visited various scenic spots in Germany and ch...

scale, in zoology

(Encyclopedia)scale, in zoology, an outgrowth, either bony or horny, of the skin of an animal. The major component of the scales of fishes is bone, and they are formed directly in the skin membrane as the fish grow...

tsunami

(Encyclopedia)tsunami tso͝onäˈmē [key], series of catastrophic ocean waves generated by submarine movements, which may be caused by earthquakes, volcanic eruptions, landslides beneath the ocean, or an asteroid ...

uncertainty principle

(Encyclopedia)uncertainty principle, physical principle, enunciated by Werner Heisenberg in 1927, that places an absolute, theoretical limit on the combined accuracy of certain pairs of simultaneous, related measur...
 

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