Is the equation `PV=RT` valid for both, isothermal and adiabatic changes?

Explanation

To determine whether the equation \( PV = RT \) is valid for both isothermal and adiabatic changes, we can analyze the definitions and conditions of these processes.

### Step-by-Step Solution:

1. **Understanding the Equation**:
The equation \( PV = RT \) is known as the ideal gas law, where:
- \( P \) = pressure of the gas,
- \( V \) = volume of the gas,
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