Planck's constant is a pretty important part of modern physics, but it's also pretty confusing. Maybe you were wondering what it was while reading about the new kilogram definition. Well never ...

Planck's constant is one of the most important numbers in all of physics. It is, essentially, the ultimate guide to the quantum world. It tells us where quantum effects are important, the fundamental ...

Universal mass: NIST's fourth-generation watt balance. (Courtesy: Tushna Commissariat) The latest version of the watt balance at the US National Institute of Standards and Technology (NIST) has made ...

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