standard atmosphere

standard atmosphere
noun
a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade
• Syn: ↑atmosphere, ↑atm, ↑standard pressure
• Hypernyms: ↑pressure unit
• Hyponyms: ↑STP, ↑s.t.p.

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noun
1. : an arbitrary ideal set of atmospheric conditions (as used in calculations of aircraft performance); specifically : the international standard specifying a temperature of 15° C and 760 millimeters pressure at sea level with a vertical temperature gradient of -6.5° C per kilometer up to 11 kilometers altitude and uniform temperature of -56.5° C above that level
2. : atmosphere 5

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1. an arbitrarily determined vertical distribution of atmospheric pressure, temperature, and density, assumed to have physical constants and conforming to parametric equations, used for calculations in ballistics, the design of pressure altimeters, etc.
2. a standard unit of atmospheric pressure, having a value of 1013.2 millibars or 29.9213 in. (760 mm) of mercury.

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standard atmosphere noun
1. 101325 newtons per square metre, or 1013250 dynes per square centimetre
2. A standard of measurement of atmospheric conditions used in comparing the performance of aircraft (aeronautics, etc)
• • •
Main Entry: ↑standard

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standard atmosphere,
a hypothetical atmosphere having an arbitrarily selected set of atmospheric conditions, used as a standard for comparing the performance of aircraft, or resolving problems in ballistics.

Useful english dictionary. 2012.

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