What is the principle of Calorimetry?

Explanation

**Step-by-Step Solution:**

1. **Understanding Calorimetry**: Calorimetry is the science of measuring the heat of chemical reactions or physical changes. It is based on the principle of conservation of energy.

2. **Heat Exchange Principle**: The principle of calorimetry states that the heat lost by a hot body is equal to the heat gained by a cold body when they are in thermal contact, provided that no heat is lost to the surroundings.

3. **Mathematical Representation**: This can be mathematically expressed as:
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