How do the principles of convection, conduction, and radiation explain how the water in the saucepan gets hot?

Question

loser66 · Answer

conduction: have to have the contact between the objects. A contacts B , then the heat transfers from A to B if the temperature of A higher than the temperature of B. And vice versa
convection: the moving of the air or the liquid, the heat among the moving is called convection
radiation : the heat comes from the source like fire, sun .... 
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