| Type: | Package |
| Title: | Converts Conductance Units |
| Version: | 1.0.2 |
| Description: | For plant physiologists, converts conductance (e.g. stomatal conductance) to different units: m/s, mol/m^2/s, and umol/m^2/s/Pa. |
| License: | MIT + file LICENSE |
| Encoding: | UTF-8 |
| Suggests: | testthat |
| RoxygenNote: | 7.2.1 |
| Imports: | magrittr (≥ 1.5), methods (≥ 4.0.0), stringr (≥ 1.4.0), units (≥ 0.6.0), tibble (≥ 2.1.1) |
| URL: | https://github.com/cdmuir/gunit |
| BugReports: | https://github.com/cdmuir/gunit/issues |
| NeedsCompilation: | no |
| Packaged: | 2022-10-18 07:29:39 UTC; cdmuir |
| Author: | Chris Muir  [aut,
cre] |
| Maintainer: | Chris Muir <cdmuir@hawaii.edu> |
| Repository: | CRAN |
| Date/Publication: | 2022-10-18 08:02:41 UTC |
Pipe operator
Description
See magrittr::%>% for details.
Usage
lhs %>% rhs
Convert conductance units
Description
Convert conductance units
Usage
convert_conductance(
.g,
P = set_units(101.3246, kPa),
R = set_units(8.31446, J/K/mol),
Temp = set_units(298.15, K)
)
Arguments
.g |
Conductance in class units. Units must convertible to one of "m/s", "umol/m^2/s/Pa", or "mol/m^2/s" |
P |
A pressure value of class |
R |
Ideal gas constant of class |
Temp |
A temperature value of class |
Value
@return a tibble in units "m/s", "umol/m^2/s/Pa", and "mol/m^2/s".
Examples
# library(gunit)
library(units)
g_sc <- set_units(10, "m/s")
convert_conductance(g_sc)
g_sc <- set_units(4, "umol/m^2/s/Pa")
convert_conductance(g_sc)
g_sc <- set_units(0.4, "mol/m^2/s")
convert_conductance(g_sc)
gunit package
Description
Convert Conductance Units
Details
See the README on GitHub
Convert g_c (\mumol CO2/m^2/s/Pa) to g_w (\mumol H2O /m^2/s/Pa)
Description
Convert g_c (\mumol CO2/m^2/s/Pa) to g_w (\mumol H2O /m^2/s/Pa)
Convert g_c (umol CO2/m^2/s/Pa) to g_w (umol H2O /m^2/s/Pa)
Usage
gw2gc(g_w, D_c, D_w, unitless, a)
gc2gw(g_c, D_c, D_w, unitless, a)
Arguments
g_w |
conductance to water vapor in units
( |
D_c |
diffusion coefficient for CO2 in air in units of m^2/s of class
|
D_w |
diffusion coefficient for H2O in air in units of m^2/s of class
|
unitless |
Logical. Should scientific units of arguments be checked and set? TRUE is safer, but slower. If FALSE, values provided are assumed to be in correct units.
|
a |
exponent used for conversion. Use 1 for still air; 0.67 for laminar flow (Jones 2014). Should be unitless. |
g_c |
conductance to CO2 in units ( |
Details
Diffusive conductance to CO2 is greater than that of H2O because of the higher molecular weight. To convert:
g_\mathrm{c} = g_\mathrm{w} (D_\mathrm{c} / D_\mathrm{w}) ^ a
g_\mathrm{w} = g_\mathrm{c} (D_\mathrm{w} / D_\mathrm{c}) ^ a
Value
Value with units \mumol / (m^2 s Pa) of class units.
Note
This function will soon be moving to the standalone gunit package.
References
Jones H. 2014. Plants and Microclimate (3rd edition). Cambridge University Press.
Examples
library(units)
D_c = set_units(1.29e-05, "m^2/s")
D_w = set_units(2.12e-05, "m^2/s")
g_c = set_units(3, "umol/m^2/s/Pa")
a = 1
g_w = gc2gw(g_c, D_c, D_w, a, unitless = FALSE)
g_w
gw2gc(g_w, D_c, D_w, a, unitless = FALSE)