JAMB - Physics (2014 - No. 21)
Heat transfer by convection in a liquid is due to the
Latent heat of vaporization of the liquid
Increased vibration of the molecules of the liquid about theit mean position
Variation of density of the liquid
Expansion of the liquid as it is heated
Paliwanag
Liquids and gases expand when they are heated. The liquid or gas in hot areas is less dense than the liquid or gas in cold areas, so it rises into the cold areas.