Physics for IGCSE & O level - Measurements And Units (Section 1 - No. 40)
Which statement is true?
Hot air is denser than cold air.
Ice is denser than water.
Oil is denser than water.
A hot-air balloon will rise upwards because hot air is less dense than cold air.
Explanation
Hot air is less dense than cold air, so a hot-air balloon rises upwards.
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