Question

Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is:

• A. dry-bulb temperature
• B. wet-bulb temperature
• C. dew point
• D. boiling point

Hint:

The wet-bulb temperature is the steady-state temperature reached when a small amount of liquid evaporates into a large unsaturated vapour-gas mixture.

Answer 1

The Correct Option is B

Step 1: Process Understanding.
When a small volume of liquid evaporates into a large volume of unsaturated vapor-gas mixture, the equilibrium temperature attained is primarily the wet-bulb temperature. This occurs because the wet-bulb temperature signifies the temperature a parcel of air would reach due to evaporative cooling.

Step 2: Clarification of Alternatives.
- Dry-bulb temperature indicates the ambient air temperature and is independent of evaporation. - Dew point is the temperature at which vapor in the air begins to condense, not the temperature associated with evaporation. - Boiling point is the temperature at which a liquid transforms into vapor, a condition not relevant here.

Final Determination: \[ \boxed{\text{B) wet-bulb temperature}} \]