Why the kilogram is no longer a physical object
In short: The international prototype kilogram was once a literal hunk of metal, but it's being replaced by fundamental constants. This video explains why defining our world in terms of ideas rather than objects is essential for modern science.
For years, the kilogram was tied to a physical object known as 'le grande k.' To ensure precision across global science, physicists are moving toward definitions based on universal constants. The meter is already defined by the speed of light, and the second by Cesium oscillations.
The new standard for mass will likely rely on either counting silicon atoms via the Avogadro approach or measuring Planck's constant using a Kibble Balance. By linking mass to energy through Einstein's E=mc², scientists can create a measurement system that remains consistent anywhere in the universe.
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