PsyCon {FAO56}

Psychrometric Constant (gamma)

Description

PsyCon returns the value of psychrometric constant.

Usage

PsyCon(P, lambda = 2.45, c_p = 1.013 * 10^(-3), eps = 0.622)

Arguments

P

A numeric scalar that denotes the atmospheric pressure [kPa].

lambda

A numeric scalar that denotes the latent heat of vaporization, 2.45 [MJ/kg].

c_p

A numeric scalar that denotes the specific heat at constant pressure, 1.013*10^(-3) [MJ/(kg*C).

eps

A numeric scalar that denotes the ratio molecular weight of water vapour/dry air = 0.622.

Details

This is a function to calculate the psychrometric constant [kPa/C].

Value

The function returns the value of the psychrometric constant [kPa/C] as a numeric scalar.

Reference

Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop evapotranspiration - Guidelines for computing crop water requirements - FAO Irrigation and drainage paper 56. Fao, Rome, 300(9), D05109.

See Also

AtmPres.

Examples

PsyCon(P = 81.8)