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 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.
Tiny bubbles appeared because it has gases dissolved in them, so when the water was boiled, the gas escaped in the form of bubbles.
Paheli had boiled out the complete water which means all the air from the water escaped out, so on boiling the boiled cooled water will not make tiny bubbles as there is no air present in it.
So,tiny bubbles will not appear as there is no dissolved air in this water.
Tiny bubbles appeared because it has gases dissolved in them, so when the water was boiled, the gas escaped in the form of bubbles.
Paheli had boiled out the complete water which means all the air from the water escaped out, so on boiling the boiled cooled water will not make tiny bubbles as there is no air present in it.
So,tiny bubbles will not appear as there is no dissolved air in this water.
