| Ideal gas | Real gas |
| $(1)$ It satisfies $PV = \mu RT$ for all temperatures and pressures. | $(1)$ It does not satisfy $PV = \mu RT$ for all temperatures and pressures. |
| $(2)$ The volume of molecules of an ideal gas is considered zero. | $(2)$ The volume of molecules of real gases is not zero. |
| $(3)$ In an ideal gas, no intermolecular forces act between molecules. | $(3)$ Depending on the distance between molecules, attractive or repulsive forces act between them. |
| $(4)$ Interatomic force is zero, hence potential energy is zero. | $(4)$ Interatomic force is not zero, hence potential energy is not zero. |
| $(5)$ Possesses only kinetic energy. | $(5)$ Possesses both kinetic energy and potential energy. |
| $(6)$ At absolute zero, the volume, pressure, and internal energy of an ideal gas become zero. | $(6)$ All real gases liquefy before reaching absolute zero, and the internal energy in the liquid state is not zero. |
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