Psychrometrics or psychrometry are terms used to describe the field of engineering concerned with the determination of physical and thermodynamic properties of gas-vapor mixtures. The term derives from the Greek psuchron (ψυχρόν) meaning "cold" and metron (μέτρον) meaning "means of measurement". Common applications The principles of psychrometry apply to any physical system consisting of gas-vapor mixtures. The most common system of in… (More on Psychrometrics)