What do you understand by the terms (i) linear expansion (ii) superficial expansion (iii) cubical expansion?
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(i) Linear expansion means change in one dimension (length) as opposed to change in volume (volumetric expansion). To a first approximation, the change in length measurements of an object due to thermal expansion is related to temperature change by a coefficient of linear thermal expansion (CLTE).
(ii) Superficial expansion is defined as the increase in surface area of the solid on heating. If you consider at 00C area of a solid is A0 then its area at t0c is given by: A0(l+βt). Unit of β is 0C-1 or K-1. Where β is known as the coefficient of superficial expansion.
(iii) Cubical expansion means that the volume of a material changes by some fixed fractional amount.
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