How can you estimate the value of functional residual capacity (FRC) ?

Explanation

To estimate the value of Functional Residual Capacity (FRC), follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of FRC**:
- Functional Residual Capacity (FRC) is the volume of air remaining in the lungs after a normal exhalation. This means it is the amount of air that stays in the lungs when you breathe out normally.

2. **Identify the Components of FRC**:
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