Which equation defines the dew-point temperature in terms of Ws and W?

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Multiple Choice

Which equation defines the dew-point temperature in terms of Ws and W?

Explanation:
Dew-point temperature is defined as the temperature at which air would become saturated given its current moisture content at a specific pressure. In psychrometrics, the saturation humidity ratio at that dew-point, Ws(p, td), equals the actual humidity ratio W. So the condition Ws(p, td) = W captures the fact that cooling the air to td would bring it to saturation with the same moisture content. The other statements refer to different properties: enthalpy relationships, dry-bulb temperature, and energy efficiency ratio are not definitions of dew point.

Dew-point temperature is defined as the temperature at which air would become saturated given its current moisture content at a specific pressure. In psychrometrics, the saturation humidity ratio at that dew-point, Ws(p, td), equals the actual humidity ratio W. So the condition Ws(p, td) = W captures the fact that cooling the air to td would bring it to saturation with the same moisture content. The other statements refer to different properties: enthalpy relationships, dry-bulb temperature, and energy efficiency ratio are not definitions of dew point.

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