What is the principle of using ammonia in refrigeration?

Explanation

### Step-by-Step Solution:

1. **Understanding Refrigeration**: Refrigeration is a process that removes heat from a designated area to lower its temperature. It typically involves the phase change of a refrigerant.

2. **Role of Ammonia**: Ammonia (NH3) is commonly used as a refrigerant in refrigeration systems. Its effectiveness is primarily due to its physical properties.

3. **High Latent Heat of Vaporization**: One of the key principles behind using ammonia in refrigeration is its high latent heat of vaporization. This means that when ammonia transitions from a liquid to a gas, it absorbs a significant amount of heat from its surroundings.

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