The isochoric process is also known as the isometric or isovolumic process. The relationship between temperature and pressure maintains a constant value.
This can be better understood with the ideal gas law:
- PV = nRT
- P is the absolute gas pressure
- V is the volume
- n is the amount of gas
- R is the ideal gas constant that is valued at (8.31 J / mol K)
- T is the temperature.
- When the volume is constant, this law can be readjusted to express the relationship of Pressure to Temperature.
- This mathematical expression between temperature and pressure is known as Gay-Lussac’s Law, thus known, by the French chemist who devised it during the 19th century.
5 Examples of an Isochoric Process
- Isochoric processes in a pressure cooker: When a pot is hermetically covered, the interior volume does not usually change, so when heat is added, both the pressure and the temperature increase rapidly.
- Isochoric processes in heat engines : Heat engines are devices that take advantage of heat transfer to perform some type of work. They use a cyclical system to transform the thermal energy that is added to them into mechanical or moving energy. Examples of this type are steam turbines and car engines.
- The Otto cycle: It is a type of thermodynamic cycle in car engines that performs the heat transfer procedure when it is turned on.
- Isobaric process: This happens at constant pressure and is prevalent in many real-life examples, such as lighting a match.
- Isothermal process : originates at constant temperature. For example, in a phase change, such as boiling water.
- Adiabatic process: There is no heat or material exchange when a gas or fluid alters its volume.