Question

When we heat water, we can find bubbles coming from it. This shows that:

• A. water contains air
• B. air contains water
• C. hot water becomes bubbles
• D. None of these

Answer 1

The correct option is A water contains air

When we heat water, we can find bubbles coming from it. This is because the solubility of gases decreases as the temperature increases and that is why the dissolved air bubbles go out from the water. Then as the boiling point of the water is reached (${100}^{\circ }C$), water vapour starts to form inside the liquid in the form of bubbles.

Hence, option (A) is correct.