### 12.8.3. UNITS

The equations of state for a real gas are normally formulated in a particular unit system and, therefore, it is necessary to know the unit system being used for the RGP properties so that the CFX-Solver can automatically convert the properties to solution units. Five unit systems are available when using an .rgp file as follows:

1. `UNITS=1` (kg, m, s, K)

2. `UNITS=2` (g, cm, s, K)

3. `UNITS=3` (lbm, in, s, R)

4. `UNITS=4` (slugs, ft, s, R)

5. `UNITS=5` (slugs, in, s, R)

If desired, the solver solution units can be set to the same units as the .rgp file in CFX-Pre. For details, see Setting the Solution Units in the CFX-Pre User's Guide.

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