Boyle's Law states that the pressure of a given mass of gas is inversely proportional to its volume, provided the temperature remains constant. Mathematically, it is represented as $P \propto \frac{1}{V}$ or $PV = k$ where $k$ is a constant.
Charles's Law: Charles's Law states that the volume of an ideal gas is directly proportional to its absolute temperature at constant pressure.
Ideal Gas Law: $PV = nRT$, combining Boyle's, Charles', and Avogadro's laws to describe the state of an ideal gas.
Kinetic Theory of Gases: A theory explaining the macroscopic properties of gases by considering their molecular composition and motion.