ASHRAE Terminology

A Comprehensive Glossary of Terms for the Built Environment
ashrae.org/ashraeterms

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standard air

(1) air weighing 0.075 lb/ft3 (1.2 kg/m3), which approximates dry air at a temperature of 70°F (21.1°C) and a barometric pressure of 29.92 in. Hg (101.3 kPa). (2) dry air at 20.0°C and 101.324 kPa having a mass density of 1.204 kg/m3.