A sphere was created out of pure silicon-28 in 2011 to help redefine the kilogram in terms of Planck's constant and Avogadro's number, and not the other way around. The precise number of atoms can be calculated by carefully measuring the surface area of the sphere.
The sphere is so round, that if it were the size of the Earth (assuming radius at equator), the height between the highest mountain and lowest valley would be 4.6 feet.
For comparison, a standard Aramith pool ball with +/- 0.05mm deviation would have mountains and valleys 18,300 feet high and deep. Mount Everest is 29,032 feet high.
The silicon sphere is approximately 8,000 times rounder than a pool ball.
90% of chalk dust is estimated to be 5um in diameter or less, which is 6000 feet in diameter, or 1.13 miles, in Earth scale. A wool cloth fiber would be 4.5 miles in diameter, almost twice as big as Manhattan.
A 6 foot tall man would be 250,000 miles tall if a pool ball was the size of the Earth. That is the distance from here to the moon.
M.C. Escher would be impressed.
The sphere is so round, that if it were the size of the Earth (assuming radius at equator), the height between the highest mountain and lowest valley would be 4.6 feet.
For comparison, a standard Aramith pool ball with +/- 0.05mm deviation would have mountains and valleys 18,300 feet high and deep. Mount Everest is 29,032 feet high.
The silicon sphere is approximately 8,000 times rounder than a pool ball.
90% of chalk dust is estimated to be 5um in diameter or less, which is 6000 feet in diameter, or 1.13 miles, in Earth scale. A wool cloth fiber would be 4.5 miles in diameter, almost twice as big as Manhattan.
A 6 foot tall man would be 250,000 miles tall if a pool ball was the size of the Earth. That is the distance from here to the moon.
M.C. Escher would be impressed.
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