_____________ temperature represents the steady-state value reached when a small volume of liquid evaporates into a large mass of unsaturated gas-vapor mixture ?
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Answer: B. Wet bulb
Explanation
Wet bulb temperature represents the dynamic equilibrium reached during steady-state evaporation. Latent heat of vaporization is supplied entirely by sensible heat transfer from the gas stream. Unsaturated gas-vapor mixtures promote continuous evaporation until thermal equilibrium is attained. Psychrometry is the study of thermodynamic properties of gas-vapor mixtures. Wet bulb temperature is measured using a thermometer covered with a wetted wick. Humidity calculations depend heavily on accurate dry bulb and wet bulb temperature readings.
Heating, ventilation, and air conditioning systems utilize wet bulb data for cooling tower design. Agricultural meteorology uses wet bulb measurements to assess atmospheric drying capacity. Industrial drying operations monitor wet bulb temperatures to control moisture removal rates. Option A measures the actual ambient temperature of the gas without evaporative effects. Option C represents the temperature at which vapor condensation begins upon cooling. Option D is incorrect because wet bulb correctly identifies this steady-state temperature.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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