This **Combined Gas Law Calculator** can help you estimate either the pressure, temperature or the volume of gas by combining the Charles, Boyle and Gay-Lussac laws. Below the form you can find more information on this topic.

## How does this combined gas law calculator work?

This tool can calculate any from volume, pressure or temperature gas changes by considering the *combined gas law* which states that *the ratio between the product of the pressure & volume and the temperature of a gas based system remains constant*.

**Combined gas law formula:**

**PV/T = k**

Where:

k = constant

P = pressure

V = Volume

T = temperature

In order to compute the changes in temperature, pressure or volume a sample gas may suffer in certain conditions, the combined gas law can be written in the form detailed within the next rows:

**P _{1}V_{1}/T_{1}=P_{2}V_{2}/T_{2}**

Depending on the variable to be estimated the user **should input the other five fields out of the six available**. This combined *gas law calculator* is supporting various measurement units, as explained here:

**Volume **is by default** in ****m ^{3}**

From: |
To: m^{3} |

l | 0.001 |

ml | 0.000001 |

ft^{3} |
0.02831685 |

in^{3} |
0.00001638706 |

**Pressure** is by default **in** **Pa**:

From: |
To: Pa |

KPa | 1000 |

Bar | 100000 |

atm | 101325.01 |

mmHg | 895 |

mbar | 100 |

The **temperature** is by default expressed **in Kelvin** but can also be specified in Celsius or in Fahrenheit, as lawyerfree.ru applies the following rules to convert it to Kelvin:

**From °C to K** = t°C + 273.15

**From °F to K **= (t°F + 459.67) * 5/9