| 1. Absolute humidity is the total weight of moisture contained per volume of air at a defined temperature. |
| 2. Specific humidity is the mass of water vapour in grams contained in one kg of air. |
| 3. Relative humidity is the ratio of water vapour actually present in the air having definite volume and temperature to the maximum amount the air can hold. |
| 4. Humidity capacity is the moisture content of air measure in gm/cc. |
A) 1 and 2 only
B) 2 and 3 only
C) 1, 2 and 3 only
D) 1, 2, 3 and 4
Correct Answer: D
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