Question 19.1

Paheli kept some water in a beaker for heating. She observed
that tiny bubbles appeared before the water started to boil.
She boiled the water for about 5 minutes and filled it in a
bottle up to the brim and kept the bottle air tight till it cooled
down to room temperature.

Why did the tiny bubbles appeared?

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Solution

Tiny bubbles appeared due to the evolution of air dissolved in water.

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