Question

Air expands when it _______________.
A) is cooled B) is heated C) is under pressure D) becomes more humid

Answer 1

Answer:

Air expands when it is heated

Answer 2

Answer:

B) is heated

When the bottle is heated, the air molecules inside start moving faster. These molecules now collide into the balloon with more energy resulting in increased pressure. The increased pressure causes the balloon to expand.A given amount (mass) of air takes up more space when it is hot.

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