Pressão parcial Dalton

P_total = ΣP_i.
Created by
Renato Passos, Eng. de Software
Reviewed by
Renato Passos, Eng. de Software

Last updated: Apr 18, 2026

P_total (atm)
1,00

Formula

Σ P_i

About this calculator

The Dalton Partial Pressure calculator is a useful tool for calculating the partial pressure of gases in a mixture. Dalton's Law states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each gas present in the mixture. This means that each gas contributes to the total pressure according to its own partial pressure.

The formula used is simple: P_total = ΣP_i, where P_total is the total pressure of the mixture and P_i is the partial pressure of each gas. To calculate the partial pressure of a gas, it is necessary to know its mole fraction and the total pressure of the mixture. The mole fraction is the proportion of the gas relative to the total moles of gases in the mixture.

This calculator is useful in various situations, such as calculating the partial pressure of oxygen in a gas mixture for breathing, or determining the partial pressure of a gas in a chemical reaction. However, it is essential to be careful with the units of measurement and ensure that the values entered are accurate.

Additionally, it is crucial to remember that Dalton's Law assumes that the gases are ideal and that there are no interactions between molecules. In practice, this is not always the case, and the results may vary slightly.

Frequently asked questions

What is Dalton's Law?

Dalton's Law states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each gas present in the mixture.

How to calculate the partial pressure of a gas?

To calculate the partial pressure of a gas, it is necessary to know its mole fraction and the total pressure of the mixture.

What are the limitations of Dalton's Law?

Dalton's Law assumes that the gases are ideal and that there are no interactions between molecules.

In what situations is this calculator useful?

This calculator is useful in various situations, such as calculating the partial pressure of oxygen in a gas mixture for breathing, or determining the partial pressure of a gas in a chemical reaction.

What precautions should I take when using this calculator?

It is essential to be careful with the units of measurement and ensure that the values entered are accurate.

Other Gases calculators