• Question: Why do ice cubes not float?

    Asked by smithmoorebell to Ben, Clare, Ezzy, Mario, Sam on 12 Mar 2012.
    • Photo: Mario Campanelli

      Mario Campanelli answered on 12 Mar 2012:


      they do float partially, since they are slightly bigger than their water equivalent in weight. Bodies float or sink according to Archimede’s law, such that a body gets an upward push equal to the weight of its volume in water. Bodies much lighter than water, like styrofoam float a lot, those with density just lower that of water, like ice cubes, just about, and those with very high density clearly sink

    • Photo: Sam Vinko

      Sam Vinko answered on 12 Mar 2012:


      Last time I checked ice does float! Ice is less dense than water so a part of it will always be above the water surface, which is what the word ‘float’ means. The difference in density between water and ice is not very large (only about 8%) so only a small part is above the water-line.

    • Photo: Elizabeth Pearson

      Elizabeth Pearson answered on 12 Mar 2012:


      They do float! Water is most dense when it’s at 4C because of how the atoms interact. That’s unusual for liquids, usually they are more dense the colder they are. Because ice is less dense than water, it pushes less water out the way and so it floats.

    • Photo: Clare Burrage

      Clare Burrage answered on 18 Mar 2012:


      They do float! I think water is the only substance we know of where the solid form can be less dense that the liquid form. Because it is less dense ice can float on the surface of water.

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