# What are the laws that form the general gas equation?

**Question: What are the laws that form the general gas equation?**

The general gas equation is a mathematical expression that relates the pressure, volume, temperature and amount of gas in a system. It is derived from three laws that describe the behavior of gases under different conditions: Boyle's law, Charles's law and Avogadro's law.

Boyle's law states that the pressure and volume of a gas are inversely proportional at constant temperature and amount of gas. This means that as the pressure increases, the volume decreases, and vice versa.

Charles's law states that the volume and temperature of a gas are directly proportional at constant pressure and amount of gas. This means that as the temperature increases, the volume increases, and vice versa.

Avogadro's law states that the volume and amount of gas are directly proportional at constant pressure and temperature. This means that as the amount of gas increases, the volume increases, and vice versa.

The general gas equation combines these three laws into one equation: PV = nRT, where P is the pressure, V is the volume, n is the amount of gas in moles, R is the universal gas constant and T is the temperature in kelvins.

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