P_a: density of dry air (g / m^3)

.get_Pa(T_leaf, pars, unitless)

Arguments

T_leaf: Leaf temperature in Kelvin
pars: Concatenated parameters (leaf_par, enviro_par, and constants)
unitless: Logical. Should function use parameters with units? The function is faster when FALSE, but input must be in correct units or else results will be incorrect without any warning.

Value

Value in g / m$^3$ of class units

Details

$$P_\mathrm{a} = P / (R_\mathrm{air} (T_\mathrm{leaf} - T_\mathrm{air}) / 2)$$

Symbol	R	Description	Units	Default
$P$	`P`	atmospheric pressure	kPa	101.3246
$R_\mathrm{air}$	`R_air`	specific gas constant for dry air	J / (kg K)	287.058
$T_\mathrm{air}$	`T_air`	air temperature	K	298.15
$T_\mathrm{leaf}$	`T_leaf`	leaf temperature	K	input

Examples


library(tealeaves)

cs <- make_constants()
ep <- make_enviropar()
lp <- make_leafpar()

T_leaf <- set_units(298.15, K)

tealeaves:::.get_Pa(T_leaf, c(cs, ep, lp), FALSE)
#> 1183.887 [g/m^3]