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In which of the following methods of heat transfer is it necessary for the objects to be directly touching one another? A. convection. B. radiation. C. conduction. D. all of these.

User Barret
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Conduction is the direct transfer of heat
User CoolUserName
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The following method that is necessary for the objects to be directly touching one another is called conduction. 
User Chaitanya Shivade
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