# R/convertUnits.R In bgctw/RespChamberProc: Processing Data from Respiration Chambers

```convert_mumolPers_to_gPerday <- function(
### convert from mumol CO2 / second to g C / day
flux	                ##<< numeric vector or array: flux
, molarMass = 12.011	##<< numeric scalar: the molar mass of the element
##of interest (default carbon) in g/mol
){
##value<< numeric vector of flux in other units
##details<<
## Concentration measures are usually given by micromol CO2 across several
## seconds, and
## the flux, i.e. its slope hence given in micromol CO2 per second.
## To compare carbon balances, the units of gC per day are more convenient.
##
## mumol are converted to mol by /1e6
## mol are converted to gC by *12.011
## per second are converted to per day by *3600*24
##
## For Carbon the conversion factor is 1.038, i.e. very close to one.
##
## In order to convert masses of other elements, specify the molarMass argument,
## e.g. for converting mol H2O per second to H2O per day,
## specify \code{molarMass=2*1.008+15.999}.
# flux * 1e-6 * molarMass * 3600*24
flux * molarMass * 0.0864
}
attr(convert_mumolPers_to_gPerday, "ex") <- function(){
convert_mumolPers_to_gPerday(c(1,10))
}

#' @export
convert_gPerday_to_mumolPers <- function(
### convert from g C / day to mumol CO2 / second
flux	                ##<< numeric vector or array: flux
, molarMass = 12.011	##<< numeric scalar: the molar mass of the element
##of interest (default carbon) in g/mol
){