# Combined Gas Law (V)

vCalc Reviewed
Equation / Last modified by KurtHeckman on 2019/02/16 17:42
V =
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vCalc.Combined Gas Law (V)
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The Combined Gas Law Volume calculator computes the volume of a gas using the combined gas law that relates the product of pressure and volume to temperature of a gas.

INSTRUCTIONS: Choose units and enter the following:

• (k) This is the proportionality constant for the gas
• (P) This is the pressure of the gas
• (T) This is the temperature of the gas

Gas Volume (V):  The calculator returns the volume in liters.  However this can be automatically converted to compatible units via the pull-down menu.

#### The Math / Science

The combined gas law is mathematically expressed as:  (P•V) / T = k.  The formula for the volume of a gas based on the combined gas law is:

V = k•T/P

where:

#### Combined Gas Law Calculators:

• Combine Gas Law (Pressure)- this solves for the pressure of the gas if you know volume, temperature and the combined gas constant for the specific gas.
• Combine Gas Law (Volume) - this solves for the volume of the gas if you know pressure, temperature and the combined gas constant for the specific gas.
• Combine Gas Law (Temperature) - this solves for the temperature of the gas if you know pressure, volume and the combined gas constant for the specific gas.
• Combine Gas Law (k) - this solves for the gas constant of proportionality of the gas if you know pressure, volume and the temperature for the specific gas.

## NOTES

The combined gas law is a gas law which is based on the combination of Charles's law, Boyle's law, and Gay-Lussac's law. The combined gas law states the ratio between the pressure-volume product and the temperature of a system remains constant.

This constant ratio can be used when comparing different conditions using the same substances because the value of k is characteristic of the gaseous substance..

These three gas laws each relate one thermodynamic variable to another mathematically while holding everything else constant. Charles's Law holds pressure constant. Boyle's Law holds temperature constant. Gay-Lussac's Law holds volume constant. The inter-dependence of these variables of pressure, temperature and volume is shown in the combined gas law.