text: what is psychometry and where it is practically applied?   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. from a psychometric chart we can find ffg variables ( if any of the 2 are known ) - dry bulb temp, wet bulb temp, percentage rh, moisture content, dew point, sp enthalpy.  the terms are mainly used in air conditioning.