Among the following, the number of state variables is .
Internal energy (U), Volume (V), Heat (q), Enthalpy (H)

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Strategy:
 State variables (or state functions) depend only on the current state of the system (initial and final), not on the path taken to reach that state. Path functions depend on the specific transition process.

Step 1: Evaluate the list
- Internal energy (): Determined by the state of the system  State variable.
- Volume (): A measurable physical dimension of the state  State variable.
- Heat (): Depends on how the process is carried out (isothermal, adiabatic, etc.)  Path function.
- Ent

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