Enter the initial pressure and temperatures, along with the final temperature into the calculator to determine the final pressure of the gas. This calculator can also evaluate any of the variables given the others are known.

## Pressure Law Formula

The following formula is used to calculate the pressure of a gas using the Pressure Law.

P2 = P1 * (T2 / T1)

Variables:

• P2 is the final pressure of the gas (Pa)
• P1 is the initial pressure of the gas (Pa)
• T2 is the final temperature of the gas (K)
• T1 is the initial temperature of the gas (K)

To calculate the final pressure of the gas, divide the final temperature by the initial temperature. Then, multiply the result by the initial pressure. This will give you the final pressure of the gas, assuming that the volume of the gas remains constant.

## What is a Pressure Law?

The Pressure Law, also known as Amontons’ Law or Gay-Lussac’s Law, is a basic principle in gas physics that states that the pressure of a given amount of gas is directly proportional to its temperature, provided that the volume remains constant. This means that if the temperature of the gas increases, the pressure also increases, and vice versa. This law is fundamental in understanding the behavior of gases under varying conditions.

## How to Calculate Pressure Law?

The following steps outline how to calculate the Pressure Law using the given formula:

1. First, determine the initial pressure of the gas (P1) in pascals (Pa).
2. Next, determine the initial temperature of the gas (T1) in kelvin (K).
3. Then, determine the final temperature of the gas (T2) in kelvin (K).
4. Using the formula P2 = P1 * (T2 / T1), substitute the values of P1, T2, and T1 into the formula.
5. Finally, calculate the final pressure of the gas (P2) in pascals (Pa).

Example Problem:

Use the following variables as an example problem to test your knowledge:

Initial pressure of the gas (P1) = 200 Pa

Initial temperature of the gas (T1) = 300 K

Final temperature of the gas (T2) = 400 K