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 airtight till it cooled down to room temperature.
(a) Why did the tiny bubbles appear?
(b) Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.

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Solution

a)
In the given case, the appearance of tiny bubbles took place as it has gases dissolved in them.
Therefore, when the water was boiled, the escaping of gas took place in the form of bubbles.
b)
In the given case, Paheli had completely boiled the water showing that all the air from the water escaped out.
Therefore, on further boiling the cooled water present in the bottle, no bubble formation will take place as there is no air present in it.
Thus, tiny bubbles will not take place as there is no air dissolved in this water.

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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 airtight till it cooled down to room temperature.

(a) Why did the tiny bubbles appeared?

(b) Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer

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(a) Why did the tiny bubbles appeared?

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