GlossaryWeather
WeatherStandard Atmosphere
Also: ISA, International Standard Atmosphere
An agreed reference atmosphere used to calibrate instruments and compare performance, defined at sea level as 15 degrees Celsius and 29.92 inches of mercury.
“The standard atmosphere at sea level is a surface temperature of 59 °F or 15 °C and a surface pressure of 29.92 inches of mercury ("Hg) or 1,013.2 mb.”
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