• Question: Why do some objects, such as doors and windows, get bigger and smaller?

    Asked by 429dagk34 to Hugh, James, Katherine, Matt, Shannon on 13 Nov 2017.
    • Photo: Hugh J. Byrne

      Hugh J. Byrne answered on 13 Nov 2017:

      They expand or contract, usually because of moisture or heat. Wood in particular is made of fibres and these have lots of space between them for the structure to change.

    • Photo: Katherine Benson

      Katherine Benson answered on 14 Nov 2017:

      These objects get bigger and smaller in response to changes in the amount of moisture (water) in the air or changes in heat. These changes make the materials (usually wood or metal) expand or contract.

    • Photo: James Brown

      James Brown answered on 15 Nov 2017:

      water (moisture)!

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