Boyle's Law states that the volume of a gas is inversely proportional to its pressure, at constant temperature and mass. This means that as the pressure increases, the volume decreases, and vice versa.
Mathematical Expression:
```
P₁V₁ = P₂V₂
```
where:
* P₁ = Initial pressure
* V₁ = Initial volume
* P₂ = Final pressure
* V₂ = Final volume
Assumptions:
* Fixed amount of gas: The number of gas molecules remains constant.
* Constant temperature: The temperature of the gas does not change.
Therefore, Boyle's Law focuses on the relationship between pressure and volume while keeping the amount and temperature of the gas constant.
