#' Barometric/total pressure (p)
#'
#' Calculates barometric pressure based on altitude. This is also called total
#' pressure.
#' Eq. 3 - ASHRAE Fundamentals Handbook 2002, Psychrometrics.
#' @param alt Vector of altitudes [m]. Defaults to 0 m (sea level).
#' @family PsychrometricGraph
#' @return Returns a vector of barometric pressure [kPa].
#' @export
#' @examples
#' bar_press()
#'
#' bar_press(alt = 1000)
#' @author Christoffer Rasmussen
bar_press <- function(alt = 0) {
# Barometric pressure (eq. 3)
return(101.325 * (1 - 2.25577e-05 * alt) ** 5.2559)
}
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