Hot air moves upward because it is ______ than surrounding air.

heavier

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lighter

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less visible

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more visible

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Solution

The correct option is B lighter
Hot air is lighter than surrounding air., hence it rises up.
This indicates that the surrounding air moves downward as it is heavier than the hot air.
Visibility of air does not have any affect on the movements of air.

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Similar questions

When a gas jar full the lower jar go upward into the jar containing air. In this experiment :

(a) air is heavier than bromine

(b) both air and bromine have the same density

(d) bromine cannot be heavier than air because it is going upwards against gravity

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