An Isochor is a specific type of thermodynamic process in which the volume of a system remains constant. During this process, any heat added or removed from the system results in a change in pressure and temperature, but the volume does not change. This is often observed in rigid containers where the gas cannot expand or compress. In an Isochor, the relationship between pressure and temperature can be described by Gay-Lussac's Law, which states that the pressure of a gas is directly proportional to its temperature when the volume is held constant. This principle is important in various scientific and engineering applications, including the study of gases and thermodynamic cycles.