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    Question

    A gap is left between two rails of a railway track to

    accommodate _____of the metal.
    A areal expansion Correct Answer Incorrect Answer
    B volume expansion Correct Answer Incorrect Answer
    C liner expansion Correct Answer Incorrect Answer
    D apparent expansion Correct Answer Incorrect Answer

    Solution

    The volume of materials changes depending on current temperature. Usually heat makes them expand, and cold leads them to contract. To a first approximation, the change in length measurements of an object ("linear dimension" as opposed to, e.g., volumetric dimension) due to thermal expansion is related to temperature change by a "linear expansion coefficient". It is the fractional change in length per degree of temperature change.

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