A plot of mass of the gas adsorbed per gram of the adsorbent varsus pressure at constant temperature is called…………

Explanation

To solve the question, we need to understand the relationship between the mass of gas adsorbed and pressure at a constant temperature. Here's a step-by-step breakdown of the solution:

### Step 1: Understand the Terms
- **Adsorption**: This is the process where molecules from a gas or liquid adhere to a solid surface.
- **Adsorbent**: This is the solid material that adsorbs the gas.
- **Isotherm**: This term refers to a line on a graph that represents the relationship between two variables at a constant temperature.

### Step 2: Identify the Variables
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