What is the expension in solid !Why in a railway line small gap is always left between the iron rails.Hindi?
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I am extremely sorry for not writing in Hindi
The answer is at a certain temp. a solid or any matte has been ovserved to expand in length
That is why in railway tracks there is gap in btw ,such that in summer when the rail tracks will expand and cause deformation in the rail tracks it will not cause damage
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