A relationship between the pressure $P$, the temperature $T$, the volume $V$ and the moles of its components $n$.
If a system is heterogeneous (involving several phases or components) then each phase will have its own equation of state.
Two examples of equation of state are:
The equation of the ideal gas
$PV=nRT$
The equation of van der Waals
$\left( P+\dfrac{an2}{V2} \right)\left(V-nb\right)=nRT$
where $a$ and $b$ are constants different for every gas. Constant $a$ represent a measure of the strength of the intermolecular atraction while $b$ represents the molecular size.
Important comments
- The laws of thermodynamics are so general that cannot be used to determine equations of state for a given system
- Equations of state must be determined experimentally
Any question? Write in the comments and I shall try to help.
Other stuff of interest
- LE01 - AC and DC voltage measurement and continuity test
- LE 02 - Start and stop push button installation 24V DC
- LE 03 - Turn on/off an 24V DC pilot light with a push button
- Minor losses - Formulas
- What is a process variable?
- What are the most important process variables?
- Time dependence of process variables
- A list of process variables
Ildebrando.
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