Which of the following is not categorised as a "mechanical operation"?
Correct answer: D. Humidification
- A. Agitation
- B. Filtration
- C. Size enlargement
- D. Humidification
Explanation
Humidification transfers water vapour into air and is therefore a gas-liquid mass-transfer operation, not a mechanical operation. Agitation, filtration, and size enlargement involve mechanical handling or separation of solids or fluids.
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