Physics
Grade-9
Easy

Question

When two systems 1 and 2 are in thermal equilibrium, _______

  1. Heat flows from 1 to 2
  2. Heat flows from 2 to 1
  3. Heat does not flow at all
  4. Heat first flows from 1 to 2 then from 2 to 1

Hint:

The heat will not flow since it's in thermal equilibrium.

The correct answer is: Heat does not flow at all


    Two physical systems are in thermal equilibrium if there is no net flow of thermal energy between them when they are connected by a path permeable to heat. Thermal equilibrium obeys the zeroth law of thermodynamics. Hence heat will not flow.

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