3.Give an example of each of the three methods of heat trans

给出3种热传导的例子：
这三种分别是：
热传导heat conduction
热对流heat convection
热辐射heat radiation
ANSWER：
Heat conduction: Plastic handle always used in pot or pan in order to reduces the heat conduction.
Heat convection: Old-fashioned radiator uses the principle of heat convection.
Heat radiation: The sun heats the earth is a kind of heat radiation.
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