Why does a desert cooler cool better on a hot dry day?

Explanation

**Step-by-Step Solution:**

1. **Understanding Evaporation**: Evaporation is the process where liquid turns into vapor. During this process, the particles of the liquid absorb energy from their surroundings, which results in a cooling effect.

2. **Energy Absorption**: When water droplets in a desert cooler evaporate, they absorb energy from the surrounding air. This energy is necessary for the water to change from liquid to vapor.

3. **Cooling Effect**: As the water evaporates and absorbs energy, it causes the temperature of the surrounding air to decrease. This is because the energy taken from the air is used for the evaporation process, leading to a cooling effect.

...