Meet the world’s roundest object… It’s the perfect sphere and it’s absolutely flawless.
The sphere is made out of a single crystal of silicon-28 atoms, and it’s purpose is to help solve the longest running problem in measurement: How to define the kilogram.
The kilogram is the only base unit with a prefix in its name, and the only one still defined by a physical artifact, the international prototype kilogram or IPK.
Roundest object in the world
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