A cusrve showing the variation of extent of adsorption with temperature at constant pressure is called……………

Answer

To solve the question, we need to identify the term that describes the curve showing the variation of the extent of adsorption with temperature at constant pressure. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- The question refers to a curve that shows how the extent of adsorption changes with temperature while keeping the pressure constant.

2. **Identifying Relevant Concepts**:
- In thermodynamics and surface chemistry, when we talk about the relationship between temperature and another variable at constant pressure, we often use the term "isobar."

3. **Applying the Concept to Adsorption**:
- Since we are discussing adsorption, we need to specify that we are looking at the extent of adsorption (the amount of adsorbate on the adsorbent) as it varies with temperature.

4. **Determining the Correct Term**:
- The correct term for a curve that shows the variation of the extent of adsorption with temperature at constant pressure is "adsorption isotherm." This is because it reflects the relationship of adsorption under isobaric conditions.

5. **Conclusion**:
- Therefore, the answer to the question is: **adsorption isotherm**.

### Final Answer:
A curve showing the variation of extent of adsorption with temperature at constant pressure is called **adsorption isotherm**.