Gas laws describe the behavior of gases in relation to pressure, volume, and temperature. These laws help us understand how gases expand, compress, and change states. Key gas laws include Boyle's Law, which states that pressure and volume are inversely related at constant temperature, and Charles's Law, which indicates that volume is directly proportional to temperature at constant pressure. Another important principle is the Ideal Gas Law, which combines the previous laws into a single equation: PV = nRT. Here, P represents pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature. These laws are essential in fields like chemistry and physics.