Answer:
lowers
Step-by-step explanation:
Moist air have lesser density than the dry air , since ,
water has an atomic mass of 18
and diatomic molecule of oxygen , the atomic mass = 32 ,
and diatomic molecule of nitrogen , the atomic mass = 28 .
There fore , considering at constant temperature , the more water vapor that displaces the other gases , the less dense the air will be .
Hence ,
The correct option is ' lowers ' .