Question

explain the expansion and contraction in materials.give examples of each

Answer 1

Expansion means expanding of something. Contraction means contraction of something. You can see this in railway lines  when winter comes it contracts and summer comes it expands. and also in wooden doors which expand on  rainy season...
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Answer 2

When something expands, or bursts outward, it is known as expansion. For example, water on freezing expands, and hence cracks the glass bottle it is contained in.


An example of contraction is making of a bimetallic strip. When a rivet is heated, it expands and is put in a hole slighly bigger than its diameter. When it cools, it contracts and thus holds the strips firmly in place.