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Depends upon the temperature of neighboring elements

Explanation:

  • The equations of heat flow in solids does not depend on which way flows up.
  • The direction of heat flow in a small element within a solid  depends on the temperature of its neighboring elements.
  • It is due to the fact that only neighboring element can decide that heat can pass from the system or into the system.
  • Heat normally flows from hot substance to cold substance.

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