The sprinkling of water slightly reduces the temperature of a closed room because

Options

A. temperature of water of less than that of the room
B. specific heat of water is high
C. water has large latent heat of vaportisation
D. water is a bad conductor of heat.

Explanation

To solve the question about why sprinkling water slightly reduces the temperature of a closed room, we can break it down step by step:

### Step-by-Step Solution:

1. **Understanding the Scenario**:
- We have a closed room where water is sprinkled on the floor. The initial temperature of the room is T1.

2. **Heat Transfer Mechanism**:
- When water is sprinkled, it absorbs heat from the surrounding environment (the floor and walls of the room) to evaporate. This process is known as evaporation.

3. **Latent Heat of Vaporization**:
- Water requires a significant amount of energy to change from liquid to vapor. This energy is referred to as the latent heat of vaporization. It is the heat absorbed by the water at a constant temperature during the phase change.

4. **Heat Absorption**:
- As the water absorbs heat from the room to evaporate, it takes energy away from the walls and floor of the room. This results in a decrease in the temperature of the room.

5. **Temperature Change**:
- The heat absorbed by the water can be expressed as:
\[ Q = m \cdot L \]
where \( Q \) is the heat absorbed, \( m \) is the mass of the water, and \( L \) is the latent heat of vaporization of water.

6. **Resulting Temperature Decrease**:
- The heat lost by the room (which is equal to the heat gained by the water) leads to a decrease in the room's temperature. If the initial temperature was T1, after the evaporation process, the new temperature will be T2, where T2 < T1.

7. **Conclusion**:
- Therefore, the correct reason for the temperature reduction in the closed room due to the sprinkling of water is that water has a large latent heat of vaporization, allowing it to absorb significant heat from the room without a change in temperature.

### Final Answer:
The correct option is **c. Water has large latent heat of vaporization**.

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