The relationship between temperature, pressure, and volume of an ideal gas is described by three laws of thermodynamics: 1. Boyle's law: At a constant temperature, the volume of an ideal gas is inversely proportional to its pressure. 2. Charles's law: At a constant pressure, the volume of an ideal gas is directly proportional to its temperature. 3. Gay-Lussac's law: At a constant volume, the pressure of an ideal gas is directly proportional to its temperature. These laws can be combined to form the ideal gas law: PV = nRT where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in Kelvin. This equation describes the relationship between temperature, pressure, and volume of an ideal gas and is useful in predicting the behavior of gases under different conditions.