Saturated vapour is compressed to half its volume without any change in temperature, then the pressure will be

Options

A. Doubled
B. Halved
C. The same
D. Zero

Explanation

To solve the question, we need to analyze the behavior of saturated vapor when it is compressed to half its volume at constant temperature.

### Step-by-Step Solution:

1. **Understand the Concept of Saturated Vapor**:
- Saturated vapor is the vapor phase of a substance that is in equilibrium with its liquid phase at a given temperature. At this point, the vapor pressure is at its maximum for that temperature.

2. **Identify the Conditions**:
- The problem states that the saturated vapor is compressed to half its volume (V/2) while maintaining a constant temperature (T).

3. **Apply the Ideal Gas Law**:
- For an ideal gas, the relationship between pressure (P), volume (V), and temperature (T) is given by the ideal gas law:
\[ PV = nRT \]
- However, in this case, we are dealing with saturated vapor, and we need to consider the saturation pressure.

4. **Recognize the Effect of Compression**:
- When the saturated vapor is compressed, some of it will condense into liquid. However, since the temperature remains constant, the saturation pressure (which depends only on temperature) will not change.

5. **Conclusion**:
- Since the saturation pressure is a function of temperature and the temperature is constant, the pressure of the saturated vapor will remain the same even after the volume is halved. Therefore, the pressure will not change.

### Final Answer:
The pressure will remain the same.

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