Define the following and give their values in a normal human adult
Tidal volume

Explanation

**Step-by-Step Solution:**

1. **Definition of Tidal Volume**: Tidal volume is defined as the amount of air that is inhaled or exhaled during a normal respiratory cycle when a person is at rest. It represents the volume of air exchanged with each breath.

2. **Measurement of Tidal Volume**: Tidal volume is measured in milliliters (ml) and indicates the volume of air that moves in and out of the lungs with each breath.

3. **Normal Values in Adults**:
- For an average healthy adult male, the tidal volume is approximately **500 milliliters (ml)**.
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