Psychometrics (H ygrometry)- · It is the study of the properties of mixtures of air and water vapour. · It’s a determination of physical and thermodynamic properties of gas-vapor mixtures . · Atmospheric air is a mixture of many gases plus water vapour and a number of pollutants. Composition of standard air are listed below- Constituent Molecular Weight Molecular fraction Oxygen 32.000 0.2095 Nitrogen 28.016 0.7809 Argon 39.944 0.0093 Carbon dioxide 44.010 0.0003 · The amount of water vapour and pollutants vary from place to place. The concentration of water vapour and pollutants decrease with altitude, and above an altitude of about 10 km...
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