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# How does covering a hot bowl of soup prevent heat losses? watch

1. Recently I took out some soup to eat and got a call from a friend. I covered it with a plate and when i came back later, it was still hot. While i was eating, i wondered how does covering this hot soup prevent heat losses. Well i thought of these three ideas but i'm not quite sure which are correct. Basically conduction, convection and evaporation. Radiation and boiling is out of the question for sure.

So my question is simply: Covering a bowl of hot soup with a plate reduces heat losses by which means? a) Conduction b) Convection c) Evaporation

I would want to believe it'd be more than one. Thanks.
2. (Original post by ksrw395)
Recently I took out some soup to eat and got a call from a friend. I covered it with a plate and when i came back later, it was still hot. While i was eating, i wondered how does covering this hot soup prevent heat losses. Well i thought of these three ideas but i'm not quite sure which are correct. Basically conduction, convection and evaporation. Radiation and boiling is out of the question for sure.

So my question is simply: Covering a bowl of hot soup with a plate reduces heat losses by which means? a) Conduction b) Convection c) Evaporation

I would want to believe it'd be more than one. Thanks.
Heat is lost by evaporation in the form of steam. Heat could be lost due to conduction but depends what material your bowl is - some will lose heat quicker than others. convection im not sure

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