Give some examples for expansion of solids?

Answer 1

All solids expand as they are heated but I guess you want some examples where this is either useful or a problem: Useful * Bimetalic strips used in thermostats. They are made by joining 2 metals with different rates of expansion together, as they get warm they bend one way, as they get cold they bend the other. Problem * Long pipes have to have S bends in them to allow for the expansion/contraction otherwise they buckle or snap. * Railway lines are laid with gaps in them so that there is room for them to expand. (This is where the ta ta ta tap sound comes from as the wheels go over the gaps.) * Bridges have to have be suspended to allow for expansion.