Question

How can you test that air contains water-vapour​

Answer 1

Answer:

we can do but

Explanation:

Just take a cold glass of water and place it anywhere for a while. You will see drop of water outside the glass. As the water vapors in the air strike the cold glass, they loose their kinetic energy and condense on the outer surface. That's why you see the water outside glass.

Answer 2

WE CAN TEST IT BY fell the presence of humidity in atmosphere