A	psychrometric coefficient °C−1·kPa−1
As	psychrometric constant incorporated air atmosphere term, °C−1
e	vapor pressure, kPa
es	saturated vapor pressure, kPa
E	error of predictive performance, %
Emax	maximum error of predictive performance, %
Emin	minima error of predictive performance, %
$\left|E\right|$	absolute error of predictive performance, %
$\left|E\right|$ave	average of $\left|E\right|$
n	number of data
P	atmosphere air pressure, kPa
RHcal	calculated RH value from empirical equation
RHsta	standard RH value from ASHRAE Handbook
T	temperature of air, °C
Td	dry bulb temperature, °C
Tw	wet bulb temperature, °C
u(RH)	uncertainty of relative humidity
u(Td)	uncertainty of dry bulb temperature
u(Tw)	uncertainty of wet bulb temperature