standard-atmosphere

standard atmosphere

noun
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 inches (760 mm) of mercury.
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WordNet
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 
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