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Thread: I need a faily quick answer on this please

  1. #1 I need a faily quick answer on this please 
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    Feb 2009
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    A student wishes to establish experimentally the number of fungal particles in a fixed volume of air. He uses a liquid medium suitable for the growth of most fungi and exposes the liquid to air in a rectangular container of dimensions 20 cm 15 cm, he then seals the container. He then measures the depth of air above the liquid inside the sealed container and finds it to be 5 cm.
    After a period of 1 week there are 9 patches of fungus growing on the liquid medium.
    Calculate the number of fungal particles present in 1 m3 in the original air sample and express your answer in scientific notation, to one significant figure.


    at exactly midnight tonight will it be today yesterday tomorrow or something else?
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