What is the volume of air remaining in the lungs after a normal breathing?

Explanation

To determine the volume of air remaining in the lungs after normal breathing, we need to understand two key components of lung volume: the Functional Residual Capacity (FRC) and the components that make it up.

### Step-by-Step Solution:

1. **Understand Functional Residual Capacity (FRC)**:
- FRC is the volume of air remaining in the lungs after a normal expiration. It is the sum of two volumes: the Expiratory Reserve Volume (ERV) and the Residual Volume (RV).

2. **Identify the Values of ERV and RV**:
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