Homework Solution

TQ 8-6

Given:

the average molecular mass of air is 29 g/(g mole)
the average molecular mass of water is 18 g/(g mole)

Therefore,

1. moist air should be less dense than dry air

2. moist air regions should be low pressure regions

Expect that a drop in pressure measured by a barometer means moist air is replacing dryer air, and, therefore that the probability of precipitation increases.