A relation between vapour pressure and temperture is known as

Options

A. Ideal gas equation
B. Boltzmam equation
C. Clausious equation
D. Clausius - Clapeyron equation

Answer

To solve the question regarding the relation between vapor pressure and temperature, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Vapor Pressure**:
- Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase at a given temperature. It varies with temperature.

2. **Identifying the Relation**:
- The question asks for a specific term that describes the relationship between vapor pressure and temperature.

3. **Recalling Relevant Equations**:
- The Clausius-Clapeyron equation describes the relationship between vapor pressure and temperature. It is a fundamental equation in thermodynamics that helps to understand phase changes.

4. **Writing the Clausius-Clapeyron Equation**:
- The equation can be expressed as:
\[ \log \left( \frac{P_2}{P_1} \right) = \frac{\Delta H_{vap}}{R} \left( \frac{1}{T_1} - \frac{1}{T_2} \right) \]
- Where:
- \( P_1 \) and \( P_2 \) are the vapor pressures at temperatures \( T_1 \) and \( T_2 \) respectively.
- \( \Delta H_{vap} \) is the enthalpy of vaporization.
- \( R \) is the universal gas constant.

5. **Conclusion**:
- Therefore, the relation between vapor pressure and temperature is known as the **Clausius-Clapeyron equation**.

### Final Answer:
The relation between vapor pressure and temperature is known as the **Clausius-Clapeyron equation**.

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