Boyle temperature
The Boyle temperature T B (named after Robert Boyle ) is the temperature at which a real gas , which is under a small pressure , behaves like an ideal gas .
At the Boyle temperature and low pressures, the pV-p graphs , to which the isotherms correspond in the pressure-volume diagram , run according to Boyle-Mariotte's gas law and are therefore horizontal:
With
- p - pressure
- V - volume
- z - compressibility factor .
If one uses the virial equations and ends the approximation with the second term of the series , the Boyle temperature is precisely the temperature at which the second virial coefficient B vanishes:
With
- a , b - Van der Waals parameters
- R - general gas constant .
At temperatures T below the Boyle temperature, B (T) is negative:
literature
- Wolfgang Nolting : Basic course in theoretical physics. Part 4: Special Theory of Relativity, Thermodynamics. 7th edition. Springer, Berlin 2010, ISBN 978-3-642-01603-5 .
Individual evidence
- ↑ Dorothea Lüdecke, Christa Lüdecke: Thermodynamics: Physico-chemical basics of thermal process engineering . 2000, ISBN 3-540-66805-5 ( page 268 in Google book search).
- ↑ Harry Pfeifer, Herbert Schmiedel, Ralf Stannarius: Compact course in physics . 2013, ISBN 978-3-519-00472-1 ( page 150 in the Google book search).