Psychrometric constant

{
  "id": "MLC-T-MET-008199",
  "term": "Psychrometric constant",
  "field": "Meteorology and atmospheric science",
  "definition": "A proportionality factor that relates the wet-bulb depression to the vapor pressure deficit in the air. This constant accounts for the energy required for evaporation from the wet-bulb thermometer and the heat transfer to it. Its value depends on atmospheric pressure and the type of psychrometer used, typically ranging from 0.0006 to 0.0008 degrees Celsius inverse.",
  "url": "https://mlchart.com/terminology/meteorology/psychrometric-constant/"
}