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Sand density / Relative sand density

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    I need a little help with some post lab write ups, hope someone can help.
    In an experiment i calculated the relative density of sand
    A - 1.092g
    B - 2.038g
    C - 0.057g
    and D - 2.766g

    I now have to compare my results with the density of building grade sand to see which of my samples would have been a suspect sand used for building a structure that had collapsed.

    Im just stuck and dont know how I can compare my results with the density of building grade sand which is around 1800 - 2000 kg/m3.

    I do feel that it is probably sand C but i have to back myself up and dont know how.

    Any help would be appreciated

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