Dewpoint

摘要

RICHARD LANGLEY from Harper Adams University College explains psychrometrics and how it relates to agricultural engineering. 'PSYCHROMETRICS' is a term used to describe the determination of physical and thermodynamic properties of gas-vapour mixtures. The term derives from the Greek psuchron meaning 'cold' and metron meaning 'means of measurement'(Wikipedia). Although the principles of psychrometry apply to any physical system consisting of gas-vapour mixtures, the most common system of interest is the mixture of water vapour and air', because of its application in heating, ventilating and air-conditioning.