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    Question

    The density of the liquid when heated

    A decreases Correct Answer Incorrect Answer
    B increases Correct Answer Incorrect Answer
    C does not change Correct Answer Incorrect Answer
    D may increase of decrease depending on pressure Correct Answer Incorrect Answer

    Solution

    The mass density of a material varies with temperature and pressure. Increasing the temperature of a substance (with some exceptions) decreases its density by increasing the volume of that substance. In most materials, heating the bottom of a fluid results in convection of the heat from bottom to top of the fluid due to the decrease of the density of the heated fluid.

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