Thermal relating to heat or changes in temperature energy is transferred to the surroundings as it is conducted through the sides of an object. A pan is made from metal, which is a good conductor of heat, but unfortunately, this means that thermal relating to heat or changes in temperature energy is transferred to the surroundings very easily. Kettles are normally made from plastic. Plastic has a lower thermal relating to heat or changes in temperature conductivity a measure of how easily an electric current or thermal energy flows through a material than metal and so less energy is transferred to the surroundings. This makes a kettle more efficient than a pan for boiling water.

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