Question

air does not contain water vapour. true or false​

Answer 1

false.
Air do contain small amount of water vapour.

Answer 2

False. Air contains water vapour.

Putting the dry glass or steel container on fridge mainly allows to get cool.

It also mainly ensures to stay still and take on the chilled glass and keep it outside on a table.

Within a few minutes, you would see water droplets condensing on the cold surface of glass or the steel container in much more efficient way.