Psychrometrics in the 2017 ASHRAE Handbook Fundamentals (source code)

= Psychrometrics in the 2017 ASHRAE Handbook Fundamentals
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https://handbook.ashrae.org/Handbooks/F17/IP/f17_ch01/f17_ch01_ip.aspx

Verified locator: Chapter1, sections1and5: dry-air/moist-air composition; humidity ratio Eq7, molecular-mass ratio0.621945 Eq8, specific humidity Eq9, distinctions from relative humidity. Definition and mass ratio are unit-independent; ideal-gas approximation used in worked derivation.