Question

when two bodies are in thermal contact the direction of flow of heat is determined by

Answer 1

Answer:

high region to low region, temperatures

by collision of molecules..

Answer 2

When two bodies are in thermal contact the direction of flow of heat is determined by the temperature difference.

Explanation:

When a cold and other hot body come in contact, there occurs a heat flow between them. Heat flows from hot to cold body until both bodies have same temperature and come in equilibrium state. The value of the heat can be found by Fourier’s which is given by  

                                          Q = -KA dT/dx

Where,  

Q = Heat

K = Thermal conductivity

A= cross sectional area in contact

dT/dx = Temperature Gradient