Is 0.00000001530 firkins as heavy as a Grain of Sand?
It's about one-tenth as heavy as a Grain of Sand
The weight of a Grain of Sand is about 0.000000110 firkins.
(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.000000110 firkins. 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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