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gaslaw

Returns the pressure, volume, weight or temperature inside a gas given the other three parameters.

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Contents

Interface
Gaslaw
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Private project under development, to help contact the author:

Interface

C++

Excel

Gaslaw

doublegaslaw(	int	`target`
	double	`pressure`
	double	`volume`
	double	`weight`
	double	`gas_constant`
	double	`temperature`	)[inline]

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

$pV = wRT$

(2)

this function is able to deduce the fifth one, where $\inline p$ is the pressure of gas, $\inline V$ is the volume, $\inline w$ is the weight, $\inline R$ is the individual gas constant and $\inline T$ 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 ingored, 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 $\inline R$ = 1130.

Example 1

#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;
}

Output

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

Note

To add table with gas constants on 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

Parameters

target	PRESSURE, VOLUME, WEIGHT, GAS or TEMPERATURE
pressure	pressure inside the gas (lb/ft absolute)
volume	volume of gas (ft)
weight	weight of gas (lb)
gas_constant	the individual gas constant (ft lb/slug R)
temperature	absolute temperature of gas (R)

Returns

The value of the desired parameter.

Authors

Lucian Bentea (July 2006)

Source Code

This module is private, for owner's use only.

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