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Less Than Kilogram

Radiolab

CHAPTER

Redefining the Kilogram

This chapter explores the shift from the traditional physical representation of a kilogram to a new definition based on the Planck constant, encapsulating the technological advancements at an underground facility in Maryland. It highlights the innovative weighing techniques, including a teeter-totter balance system, and the global efforts to achieve precise measurements. The narrative culminates in a significant vote in France that marked a pivotal change in how mass is understood and defined.

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