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: Understanding the process.
When a small amount of liquid evaporates into a large volume of unsaturated vapour-gas mixture, the steady-state temperature reached is essentially the **wet-bulb temperature**. This is because the wet-bulb temperature represents the temperature that a parcel of air would reach if it were cooled by evaporation.

Step 2: Explanation of the other options.
- Dry-bulb temperature represents the actual air temperature and is not related to evaporation. - Dew point is the temperature at which the vapour in the air starts to condense and is not the temperature during evaporation. - Boiling point refers to the temperature at which the liquid changes to vapour, which is not applicable in this scenario.

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