Volume occupied by gas at `T_(c )` and `P_(c )` is called........

Explanation

To solve the question, we need to identify the terms associated with the critical temperature (Tc) and critical pressure (Pc) of a gas.

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Critical Temperature (Tc)**: This is the temperature above which a gas cannot be liquefied, regardless of the pressure applied.
- **Critical Pressure (Pc)**: This is the pressure required to liquefy a gas at its critical temperature.

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