Subtract water vapor pressure at 37°C when fully saturated

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Subtract water vapor pressure at 37°C when fully saturated

The key idea is vapor pressure deficit: the amount of water vapor needed to bring inspired air at body temperature up to full saturation. At 37°C, air that is fully saturated has a water vapor pressure of about 47 mmHg, which corresponds to roughly 43.8 mg of water per liter of gas. The subtraction step uses the current body humidity (the actual water vapor present) and subtracts it from the saturated value. In this scenario, if the current humidity is effectively zero, the deficit equals the full saturated value: 47 mmHg or 43.8 mg/L. This shows how much more humidity the gas could carry to reach full saturation. The other options would misstate the operation or the units for this context.

The key idea is vapor pressure deficit: the amount of water vapor needed to bring inspired air at body temperature up to full saturation. At 37°C, air that is fully saturated has a water vapor pressure of about 47 mmHg, which corresponds to roughly 43.8 mg of water per liter of gas. The subtraction step uses the current body humidity (the actual water vapor present) and subtracts it from the saturated value. In this scenario, if the current humidity is effectively zero, the deficit equals the full saturated value: 47 mmHg or 43.8 mg/L. This shows how much more humidity the gas could carry to reach full saturation. The other options would misstate the operation or the units for this context.

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