Psychrometrics
（重定向自Psychrometry）
![](/Images/godic/202502/05/Cloud_forest_mount_kinabalu-withHygrom2446.jpg")
![A psychrometric chart for sea-level elevation](/Images/godic/202502/05/PsychrometricChart.SeaLevel.SI.svg2447.png")
![Mollier Diagram (Chart), IP Units](/Images/godic/202502/05/page1-220px-Mollier.pdf2447.jpg")
Psychrometrics or psychrometry or hygrometry 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".