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0.0000290 kilograms is about six-and-a-half times as heavy as a Grain of Sand.
In other words, the weight of a Grain of Sand is 0.150 times that amount.
(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.00000440 kilograms. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.
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