If tidal volume is 0.6 L, what is the estimated normal vital capacity (VC) using the rule VC ≈ 10 × Vt?

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Multiple Choice

If tidal volume is 0.6 L, what is the estimated normal vital capacity (VC) using the rule VC ≈ 10 × Vt?

Vital capacity can be quickly estimated from tidal volume using a simple rule: VC is about ten times Vt. With a tidal volume of 0.6 L, multiply by ten to get 0.6 × 10 = 6 L. This gives the estimated normal VC for a resting adult in a practical, quick-check context. The other numbers don’t fit the rule: 0.6 L is just the tidal volume, not the maximum air exhaled after a deep breath; 3 L and 12 L are farther from the 10× relationship for this Vt and are not the standard estimate in this rule of thumb.

Vital capacity can be quickly estimated from tidal volume using a simple rule: VC is about ten times Vt. With a tidal volume of 0.6 L, multiply by ten to get 0.6 × 10 = 6 L. This gives the estimated normal VC for a resting adult in a practical, quick-check context. The other numbers don’t fit the rule: 0.6 L is just the tidal volume, not the maximum air exhaled after a deep breath; 3 L and 12 L are farther from the 10× relationship for this Vt and are not the standard estimate in this rule of thumb.

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