ABSTRACT
Percentrelativehumidityisthebestknownandperhapsthemostwidelyusedmethod forexpressingthewatervaporcontentofair.Percentrelativehumidityisdefinedasthe ratiooftheprevailingwatervaporpressure,tothewaterthevaporpressureiftheairwere saturated,multipliedby100:
(4.1)
Basically,percentrelativehumidityisanindicatorofwatervaporsaturationor deficitofthegasmixture.AmeasurementofRHwithoutacorrespondingmeasurement ofdrybulbtemperatureisnotofparticularvalue,sincewatervaporcontentcannotbe determinedfrompercentRHalone.
