Why is salt sprinkled under ice cube trays in a refrigerator?

Explanation

### Step-by-Step Solution:

1. **Understanding Freezing Point**: The freezing point of water is generally 0 degrees Celsius. This is the temperature at which water turns into ice.

2. **Role of Salt**: When salt is added to water, it causes a phenomenon known as "freezing point depression." This means that the freezing point of the water is lowered.

3. **Effect of Salt on Ice Cube Trays**: By sprinkling salt under the ice cube trays, the water beneath the trays will have a lower freezing point due to the presence of salt. This means that the water can remain in a liquid state even at temperatures below 0 degrees Celsius.

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