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The wall between two thermal systems that allows the flow of heat from one to another to bring thermal equilibrium is called

  • A.adiabatic wall
  • B.insulated wall
  • C.diathermic wall
  • D.semiconducting wall
  • E.non-conducting wall

Answer: C

It is called a diathermic wall.

In the zeroth law of thermodynamics, a diathermic wall is a conducting wall that lets heat pass between two systems, so that they come to the same temperature, thermal equilibrium.

An adiabatic wall is the opposite: an ideal insulator that allows no heat flow, so 'insulated wall' and 'non-conducting wall' describe the adiabatic case too. 'Semiconducting wall' is not a thermodynamic term.

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