Consider the following statements: 1. Absolute humidity is expressed in terms of grams of moisture per kilogram of air. 2. Specific humidity is expressed as grams of moisture per cubic metric of air. 3. Relative humidity has no unit and is expressed in terms of percentages.

Consider the following statements: 1. Absolute humidity is expressed i

1.	Consider the following statements: 1. Absolute humidity is expressed in terms of grams of moisture per kilogram of air. 2. Specific humidity is expressed as grams of moisture per cubic metric of air. 3. Relative humidity has no unit and is expressed in terms of percentages.
A.	Only 1 is correct
B.	Only 2 is correct
C.	Only 3 is correct
D.	1, 2 and 3 are correct
Answer» D. 1, 2 and 3 are correct