atmosprops {hydraulics}

Functions to calculate ICAO standard atmospheric properties: temperature, density, and pressure.

Description

Functions to calculate ICAO standard atmospheric properties: temperature, density, and pressure.

Usage

atmtemp(alt = NULL, units = NULL, ret_units = FALSE)

atmpres(alt = NULL, units = NULL, ret_units = FALSE)

atmdens(alt = NULL, units = NULL, ret_units = FALSE)

Arguments

alt

the altitude (above mean sea level). If excluded, sea level is assumed [m or ft]

units

character vector that contains the system of units [options are SI for International System of Units and Eng for English (US customary) units.

ret_units

If set to TRUE the value(s) returned are of class units with units attached to the value. [Default is FALSE]

Value

the temperature of air for the standard atmosphere for the atmtemp function [^{\circ}C or ^{\circ}F]

the absolute pressure of air for the standard atmosphere for the atmpres function [N m^{-2} or lbf ft^{-2}]

the density of air for the standard atmosphere for the atmdens function [{kg}\,{m^{-3}} or {slug}\,{ft^{-3}}]

Author(s)

Ed Maurer

Examples

#Find standard atmospheric temperature at altitude 8000 m
atmtemp(alt = 8000, units = 'SI')

#Find standard atmospheric pressure assuming default altitude of zero (sea-level)
atmpres(units = 'Eng', ret_units = TRUE)

#Find standard atmospheric density at altitude 15000 ft 
atmdens(alt = 15000, units = 'Eng')