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Fri 30 Sep, 2016 08:40 am
4.716278×10²⁰ molecules in a drop of water, how many grains of sand would this represent.
@Maxpics,
You could say that a grain of sand weights ~10mg, so (10 x 10-3)(4.7 x 10 20)= 47 x 10^17 gm. If you use 1000 gm to the kg and 1000 kg to the metric ton you get 47 x 10^11 metric tons.