If this question is for an exam, the answer is probably within your science textbook and could be in your class notes. But, if you’re in a jam and can’t find the answer in either before the big test day, the three methods of heat transfer are: conduction, convection and radiation.
Conduction occurs when surfaces are in direct contact with each other (touching). Convection occurs when liquids and gases move up and down from expanding or contracting as they heat and cool, such as with boiling water. Radiation is when the electromagnetic waves go through space (don’t directly touch, but you can feel the heat). An example is feeling heat from the sun.
Check out this illustration below–all three forms are present when boiling a pot of water:
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