This function calculates the temperature and pressure dependent psychrometric constant.
psychro(tc, pa, kMa = 0.028963, kMv = 0.01802)
double, Pa/K.
double, air temperature, degrees C.
double, atm pressure, Pa.
double, molecular weight of dry air, kg/mol. Default: \(0.028963\) (Tsilingiris, 2008)
double, molecular weight of water vapor, kg/mol. Default: \(0.01802\) (Tsilingiris, 2008)
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