Enter the total pressure and mole fraction of that substance to calculate the partial pressure. The partial pressure is calculated through the use of Dalton’s laws of partial pressure.

## Partial Pressure Formula

The following formula is used by the calculator to evaluate the partial pressure of a substance.

PP = TP * Mole Fraction

- Where PP = partial pressure
- TP = total pressure
- Mole Fraction is the fraction of moles of substance (must be less than 1)

Partial pressures can also be calculated through the ideal gas law, and both methods of Henry’s Law.

## Partial Pressure Definition

Partial pressure is a term used to describe the portion of pressure that one specific substance exerts when examining an entire gas. Perhaps, we should take a step back. Pressure is a force applied equally over a surface. In the case of an ideal gas, the gas exerts an outward force on the surroundings.

The partial pressure is the force that 1 singular substance exerts out of the total force of the gas. In an ideal gas it’s directly proportional to the moles of substance to the total moles. This means if we know the fraction of the moles of the substance to the total moles, we can simply multiply it by the total pressure to get the partial pressure.

## How to calculate partial pressure?

The following example goes over how you determine the partial pressure of a substance in an ideal gas. Let’s assume that a gas is comprise of 3 different substance, oxygen, nitrogen, and helium. We want to know the partial pressure that oxygen exerts compared to the total pressure.

- First, we must measure the total pressure. This can be done using several measurement devices, but for this example we will assume we know it’s 200 psi.
- Next, we need to determine the mole fraction of oxygen to the total moles. We will say the breakdown is as follows, 200 moles – 200 moles – 200 moles, for all 3 substance. Therefore the mole fraction is 1/3.
- Finally, plug in all of the numbers into the equation above. PP = TP * 1/3 = 66.66 psi.
- Analyze the results and adjust the calculation.

As mentioned previously, the partial pressure can also be calculated through the use of the ideal gas law. Ideal gases are unique in that the pressure is directly proportional to volume, temperature, and number of moles. Therefore, if you simply enter the number of moles of your specific substance, and you know the volume and temperature of the entire gas, you can calculate the partial pressure.

## FAQ

**What is partial pressure?**

Partial pressure is a term used to describe the portion of pressure that one specific substance exerts when examining an entire gas.

For more science and engineering calculators, click here.

## Related Terms

partial pressure calculator |

partial pressure formula |

how to calculate partial pressure |

how to find partial pressure |

partial pressure equation |

dalton’s law formula |

dalton’s law of partial pressure formula |

dalton’s law equation |

finding partial pressure |

how to find total pressure |

dalton’s law of partial pressure equation |

formula of partial pressure |

how to calculate partial pressure from moles |

how to determine partial pressure |

how to find partial pressure of a gas |

how to calculate partial pressure of a gas |

calculate partial pressure given kp and temperature |

daltons gas law formula |

how do you find partial pressure |

how to find mole fraction of a gas |

how do you calculate partial pressure |

how to calculate partial pressure of oxygen |

how is the partial pressure of a gas in a mixture calculated |

how to calculate the partial pressure |

how to calculate mole fraction of gases |

dalton’s law calculator |

calculate partial pressure of oxygen |

how to calculate equilibrium partial pressure |

how to find the partial pressure of a gas |

partial pressure of gas formula |

how to find equilibrium partial pressure |

partial pressure formula chemistry |

dalton equation |

partial pressure of oxygen formula |

determining partial pressure |

calculate the mole fraction of each gas |

partial pressure calculator atm |

dalton’s law of partial pressure calculator |

how to find partial pressure at equilibrium |

how to figure out partial pressure |

mole fraction calculator gas |

formula for dalton’s law of partial pressure |

h2s partial pressure calculator |

how to calculate partial pressure of co2 |

dalton’s partial pressure formula |

finding total pressure |

dalton’s law formula and examples |

how will you determine the partial pressure of n2 in the atmosphere |

how to find mole fraction from partial pressure |

how to find partial pressure of oxygen |

formula partial pressure |

how to calculate partial pressure from total pressure |

partial vapour pressure formula |

how to find partial pressure from kp |

formula to find partial pressure |

partial pressure formula kp |

partial pressure equilibrium equation |

formula to calculate partial pressure |

calculate equilibrium partial pressure |

how to solve partial pressure problems |

how to find partial pressure given total pressure |

equation of partial pressure |

how do you find the partial pressure of a gas |

formula of dalton’s law of partial pressure |

partial pressure formula with mole fraction |

formula for dalton’s law |

how to find the total pressure of a gas mixture |

partial pressure equation chemistry |

formula of dalton’s law |

daltons gas law equation |

how to calculate mole fraction from partial pressure |

how to calculate h2s partial pressure |

partial pressure calculation example |

co2 partial pressure calculator |

how to find total pressure of a gas mixture |

mole fraction formula partial pressure |

partial pressure of water calculator |

dalton’s partial pressure equation |

how do you find the partial pressure |

equation for dalton’s law of partial pressure |

how to calculate the partial pressure of oxygen |

calculate total pressure of gas mixture |

dalton’s law of partial pressure mathematical equation |

equilibrium partial pressure formula |

converting partial pressure to concentration |

how to calculate partial pressure of h2s |

dalton’s law partial pressure formula |

how to find partial pressure of water vapor |

dalton’s partial pressure law formula |

partial pressure of oxygen calculation |

partial pressure formula gas |

how to calculate partial pressure of water |

how to calculate partial pressure of hydrogen gas |

partial pressure of gas equation |

calculate partial pressure of gas |