[Solved] A gap is left between two rails of a railway track to accommodate of the metal.

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Q.	A gap is left between two rails of a railway track to accommodate of the metal.
A.	areal expansion
B.	volume expansion
C.	liner expansion
D.	apparent expansion
Answer» C. liner expansion
Explanation: 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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