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    Physics
    Grade-9
    Easy

    Question

    Two systems in contact are in thermal equilibrium. This means that ____.

    1. They are at equal pressures
    2. They are at the same temperature
    3. They have the same number of moles
    4. They are of the same volume

    Hint:

    Thermal equilibrium is the state of a system in which all parts are at the same temperature.

    The correct answer is: They are at the same temperature

      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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