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    Physics
    Grade-9
    Easy

    Question

    When there is no heat exchange between the system and the reservoir, ____.

    1. The system is said to have enough heat
    2. The reservoir is said to have enough heat
    3. The system and the reservoir are said to be in thermal equilibrium
    4. The system is not connected to the reservoir

    Hint:

    Answer is option 2

    The correct answer is: The system and the reservoir are said to be in thermal equilibrium

      Heat is the flow of energy from a high temperature to a low temperature. When these temperatures balance out, heat stops flowing, then the system (or set of systems) is said to be in thermal equilibrium. Thermal equilibrium also implies that there's no matter flowing into or out of the system.

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