In this case, the flow velocity multiplied by the length of the path along the center of the toroidal channel must be zero or a whole-number multiple of a fundamental quantity determined by Planck's constant and the mass of a helium atom.

Superfluid gyro detects Earth's spin by Peterson, I. / Science News

Both groups use electrical measurements in somewhat different ways to link the mass standard to Planck's constant, a fundamental quantity in quantum physics.

Tidying up the kilogram by Peterson, Ivars / Science News

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