Pressure vs volume graph at constant temperature is known as…………….

Explanation

**Step-by-Step Solution:**

1. **Understanding the Terms**: The question asks about a graph that plots pressure against volume while keeping the temperature constant.

2. **Identifying the Process**: In thermodynamics, when we refer to a process where temperature remains unchanged, it is specifically termed as an "isothermal process."

3. **Breaking Down the Term**: The word "isothermal" can be broken down into two parts:
- "Iso" means constant or unchanged.
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