Convection heat transfer is also occur in the two compounds status is liquid and ก๊าซ because things can move the floating direction only. Because when the matter has been heat can be expanded.And matter with lower temperature, it will come down to replace this phenomenon with the example is the land, the sea breeze, etc., the thermal conductivity is heat transfer by movement of molecules through the solid or fluid through at present.The heat per unit area per unit time. The type of convection. The natural convection heat transfer or free and forced convection
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