54 Paheli kept some water in a beaker for heating. She observed that tiny Bubbles appear 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 cooled down to room temperature.
(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

Paheli had completely boiled the water, which means that all of the air had gone, therefore when the boiled cooled water is boiled, it will not produce little bubbles because there is no air in it.
Because there is no dissolved air in this water, small bubbles will not appear.

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Question 19.2

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

Question 10

Paheli had brought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this

54 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?

Q. Will the tiny air bubbles seen before the water actually boils, also appear if we do the boiling water in a vessel activity by reheating boil water kept in an air tight bottle?

Q. Garima observed that when she left her tightly capped bottle full of water in the open sunlight, tiny bubbles formed all around inside the bottle. Help Garima to know why it happened?

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Paheli had completely boiled the water, which means that all of the air had gone, therefore when the boiled cooled water is boiled, it will not produce little bubbles because there is no air in it.Because there is no dissolved air in this water, small bubbles will not appear.

Paheli had completely boiled the water, which means that all of the air had gone, therefore when the boiled cooled water is boiled, it will not produce little bubbles because there is no air in it.
Because there is no dissolved air in this water, small bubbles will not appear.