text: Psychometrics - it is the study of HUMID air. Humid air is a mix of dry air & water vapour ( Steam ). Untreated air always contain water vapour to a greater or lesser extent.A graphical representation of state of humid air sample is psychometric chart.\nfrom a psychometric chart we can find ffg variables ( if any of the 2 are known ) -\nDry bulb temp, wet bulb temp, percentage RH, Moisture content, Dew point, Sp enthalpy.\n\nThe terms are mainly used in air conditioning.