28. Observe the picture and answer the following questions:
a) What happens to the balloon when the glass bottle is kept in hot water and then in cold water?
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When the air inside the plastic bottle is warmed, it expands and needs more space, therefore it stretches out the balloon. When the bottle is transferred to the icy cold water, the air is cooled; it contracts and needs less space, so the balloon deflates.
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Answer:The balloon inflates when the bottle is kept in hot water because the air inside the bottle expands when it gets heated due to the hot water. Then it rushes/occupies space in the balloon, inflating it.
The balloon deflates when the bottle is kept in cold water because the air inside the bottle contracts when gets cooled due to the cold water. Then this air remains into the bottle, deflating the balloon.
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