Internal quantity of state
An internal state variable is a state variable that depends both on the generalized coordinates of the external bodies and on the mean values of the coordinates and on the velocities of the particles in the system.
Examples of internal state variables are the density and the energy of a system.
The internal variables of a thermodynamic system in equilibrium depend only on its external variables and on the temperature :
The following applies:
- y k internal quantity of state
- x 1 ... n external state variables
- T temperature
Individual evidence
- ↑ Axel Schönbucher Thermal Process Engineering: Fundamentals and calculation methods for equipment and processes 1st edition. Springer Verlag, 2002, ISBN 978-3-540-42005-7