Question

How can you test that air contains water-vapour​

Answer 1

Answer:

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 vapours in the air strike the cold glass, they loose their kinetic energy and condense on the outer surface. From this we could understand that air contains water vapour

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Answer 2

Answer:

according to the steps you can test

Explanation:

Follow these steps :-

1.) Take a glass full of chilled water.

2.) Wait for few minutes .

3.) You will notice some droplets of water on the sides of the glass.

4.) This is because the water vapor present in the atmosphere condense on the       walls of the glass.

Hence it is proved that air contains water vapour.