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splash (version 1.0.2)

psychro: Calculate psychrometric constant

Description

This function calculates the temperature and pressure dependent psychrometric constant.

Usage

psychro(tc, pa, kMa = 0.028963, kMv = 0.01802)

Value

double, Pa/K.

Arguments

tc

double, air temperature, degrees C.

pa

double, atm pressure, Pa.

kMa

double, molecular weight of dry air, kg/mol. Default: \(0.028963\) (Tsilingiris, 2008)

kMv

double, molecular weight of water vapor, kg/mol. Default: \(0.01802\) (Tsilingiris, 2008)

References

Allen, R.G., Pereira, L.S., Raes, D. and Smith, M., 1998. Crop evapotranspiration-Guidelines for computing crop water requirements-FAO Irrigation and drainage paper 56. Food and Agriculture Organization of the United Nations, Rome, 300(9), p.D05109. Available: http://www.fao.org/docrep/x0490e/x0490e07.htm