gaslaw

Given four of the five parameters in the ideal gas law:

this function is able to deduce the fifth one, where $p$ is the pressure of gas, $V$ is the volume, $w$ is the weight, $R$ is the individual gas constant and $T$ is the absolute temperature in degrees Rankine.

In order to return the desired parameter, the function takes a target argument which can be PRESSURE, VOLUME, WEIGHT, GAS or TEMPERATURE correspondingly. The value of the desired parameter as argument in the function call is ignored, but a convenient way is to denote it by a null value.

You may notice that in the example code below we are considering carbon dioxide with gas constant $R$ = 1130.

#include <stdio.h>
#include <codecogs/engineering/fluids/imperial/gaslaw.h>

int main()
{
  double
  p = Engineering::Fluids::Imperial::gaslaw
  (PRESSURE, 0, 1000, 850.3, 1130, 10),
  V = Engineering::Fluids::Imperial::gaslaw
  (VOLUME, 9608.39, 0, 850.3, 1130, 10),
  w = Engineering::Fluids::Imperial::gaslaw
  (WEIGHT, 9608.39, 1000, 0, 1130, 10),
  R = Engineering::Fluids::Imperial::gaslaw
  (GAS, 9608.39, 1000, 850.3, 0, 10),
  T = Engineering::Fluids::Imperial::gaslaw
  (TEMPERATURE, 9608.39, 1000, 850.3, 1130, 0);

  printf("    Pressure = %.2lf lb/ft^3\n", p);
  printf("      Volume = %.2lf ft^3\n", V);
  printf("      Weight = %.2lf lb\n", w);
  printf("Gas constant = %.2lf ft lb/slug deg.R\n", R);
  printf(" Temperature = %.2lf deg.R\n", T);

  return 0;
}

Pressure = 9608.39 lb/ft^3
      Volume = 1000.00 ft^3
      Weight = 850.30 lb
Gas constant = 1130.00 ft lb/slug deg.R
 Temperature = 10.00 deg.R

Parameters

Returns

See a table of gas constants at http://www.engineeringtoolbox.com/individual-universal-gas-constant-d_588.html

References

The Engineering Division, Crane Co., "Flow of fluids through valves, fittings, and pipe", Chicago, 1957