get_psychrometric_constant: Calculate the psychrometric constant
In gopalpenny/fao56:
Description
Usage
Arguments
Details
Examples
View source: R/fao_penman_monteith.R
Description
Calculate the psychrometric constant
Usage
1
get_psychrometric_constant(z = 0, P_kPa = NULL)
Arguments
z
elevation in m. Takes precedence over P_kPa
P_kPa
Pressure in kPa
Details
Calculates the psychrometric constant as
gamma = cp * P / (M_water_air * l), org
if P_kPa is given, it takes precedence over z. If z is used, pressure is calculated
according to get_P_atmosphere().
gamma = 0.663e-3 P
gamma psychrometric constant, kPa / deg C,
P atmospheric pressure, kPa
l latent heat of vaporization, 2.45 MJ / kg,
cp specific heat at constant pressure, 1.013e-3, MJ / kg / deg C
M_water_air ratio molecular weight of water vapor/dry air = 0.622.
Examples
1
2
3
get_psychrometric_constant(P = 101.325)
get_psychrometric_constant(z = 231)
get_psychrometric_constant(P = 98.59907)
gopalpenny/fao56 documentation built on Feb. 14, 2022, 6:01 a.m.
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Description Usage Arguments Details Examples
View source: R/fao_penman_monteith.R
Description
Calculate the psychrometric constant
Usage
1 | get_psychrometric_constant(z = 0, P_kPa = NULL)
|
Arguments
z |
elevation in m. Takes precedence over P_kPa |
P_kPa |
Pressure in kPa |
Details
Calculates the psychrometric constant as
gamma = cp * P / (M_water_air * l), org
if P_kPa is given, it takes precedence over z. If z is used, pressure is calculated according to get_P_atmosphere().
gamma = 0.663e-3 P
gamma psychrometric constant, kPa / deg C, P atmospheric pressure, kPa l latent heat of vaporization, 2.45 MJ / kg, cp specific heat at constant pressure, 1.013e-3, MJ / kg / deg C M_water_air ratio molecular weight of water vapor/dry air = 0.622.
Examples
1 2 3 | get_psychrometric_constant(P = 101.325)
get_psychrometric_constant(z = 231)
get_psychrometric_constant(P = 98.59907)
|
R Package Documentation
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