1000 tiny mercury droplets coalesce to form a bigger drop .In this process , the temperature of the drop

Options

A. decreases
B. increases
C. does not change
D. may increases or decrease depending upon the size of the drop

Explanation

To solve the question regarding the temperature change when 1000 tiny mercury droplets coalesce to form a bigger drop, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding Coalescence**: When tiny mercury droplets come together to form a larger droplet, they undergo a process called coalescence. This involves the merging of the smaller droplets into one larger droplet.

**Hint**: Think about what happens to the surface area when multiple small droplets combine into one larger droplet.

2. **Surface Area Consideration**: Initially, when there are 1000 tiny droplets, the total surface area is larger compared to when they are combined into a single larger droplet. This is because smaller droplets have a higher surface area-to-volume ratio.

**Hint**: Recall that smaller droplets have more surface area relative to their volume compared to a larger droplet.

3. **Molecular Proximity**: As the droplets merge, the molecules within the droplets come closer together. The distance between the molecules decreases as they form a single larger droplet.

**Hint**: Consider how the arrangement of molecules changes when they transition from multiple droplets to a single droplet.

4. **Energy Release**: When the molecules come closer together, the potential energy of the system decreases. This decrease in potential energy results in the release of energy into the surroundings.

**Hint**: Think about the relationship between potential energy and molecular interactions; closer molecules generally have lower potential energy.

5. **Effect on Internal Energy**: The energy that is released during the coalescence process contributes to an increase in the internal energy of the larger droplet. Since internal energy is directly related to temperature, an increase in internal energy leads to an increase in temperature.

**Hint**: Remember that internal energy and temperature are directly proportional; as one increases, so does the other.

6. **Conclusion**: Therefore, as the tiny mercury droplets coalesce into a larger droplet, the temperature of the resulting droplet increases due to the release of energy when the molecules come closer together.

**Final Answer**: The temperature of the drop increases.