atmo
nounEtymology From atmosphere.
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Natural sciences, Physical sciences, Physics Dated The standard atmospheric pressure used in certain physical measurements and calculations; conventionally, that pressure under which the barometer stands at 760 millimeters, at a temperature of 0° Centigrade, at the level of the sea, and in the latitude of Paris.
- 1880? William Thomson, 1st Baron Kelvin, Heat under a constant pressure of one atmo
- In this case, at a pressure of one atmo, the quantity of gas absorbed by one gramme of water is .875 gramme at 0°C.1891, John Parker, Elementary Thermodynamics, page 309:
1 more example
- Now the above change of ratio is established at a pressure about 2.5/10⁶ atmo as given by log. dec., when the mean free path of a molecule of air ought to be about 10⁶ × .00001 ÷ 2.5 centim. or 4 centim., which is about the radius of the bulb.1897 February, William Sutherland, “Two New Pressure-Gauges for the Highest Vacua”, in Philosophical Magazine, volume 43, number 261, page 88:
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Abbreviation, Clipping, Colloquial Clipping of atmosphere