Correction for the weight of a Grain of Sand
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How heavy is 0.000625 grams?
It's about one-tenth as heavy as a Grain of Sand
The weight of a Grain of Sand is about 0.0044 grams.
(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.0044 grams. 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.