Wet cold weather is much more penetrating than dry cold weather. Explain.

Explanation

The average molecular mass of dry air is about 29.16 as calculated below :
`"Average molecular mass of air"=(71xx28+29xx32)/(100)`
`=29.16`
However, average molecular mass of moist air is less than 29.16 because of the presence of water vapours (mol. mass = 18) as
Average molecular mass of moist air
`=(%" of dry air "xx29.16+"% of water vapours "xx18)/(100)`
Since the penentration power is inversely proportional to molecular mass, the wet cold weather will be much more penetrating than dry cold weather.