The principle of heat transfer is illustrated in the video bellow. The temperature in the tip of the flame of a candle is around 1,500 °F (816 °C). A balloon coming in contact with the flame will burst, because heat is transferred from the flame to the thin surface of the balloon increasing its temperature (heat content). However, if the balloon if filled with a certain amount of water, the heat from the flame will not build up on the balloon’s surface because it will be transferred to the water, which in effect acts as a heat sink preventing the balloon from bursting!
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