Psychrometric Graph [exclusive] Jun 2026

If you know any two of the following seven properties, you can find a specific point on the graph and read the remaining five:

The psychrometric graph, also known as the psychrometric chart, is a graphical representation of the thermodynamic properties of air and its relationship with water vapor. It is a fundamental tool used in various fields such as heating, ventilation, and air conditioning (HVAC), meteorology, and drying processes. The graph provides a visual representation of the complex relationships between the physical properties of air, including temperature, humidity, and enthalpy. psychrometric graph

These are slightly sloped diagonal lines indicating the volume occupied by a unit mass of dry air (cubic feet per pound). This is critical for sizing fans and ducts. If you know any two of the following