kilogram
The Definition of a Kilogram Just Changed Worldwide
The kilogram is the last unit of measurement to be untethered from an artificial object.
Inside the High-Tech Lab Where Scientists Are Redefining the Kilogram
The watt balance will tell us what a kilogram is.
This Perfect Silicon Sphere is the Most Precise Kilogram Ever
The General Conference of Weights and Measures comes closer to finding their new standard.
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At 125 Years Old, the Kilogram Is Approaching Retirement
The prototype kilogram we measure all mass against will soon be replaced by more constant standards.
How to Replace the Kilogram, the Last Physical Unit of Measurement
Of course, the whole anthropocentric measurement thing is rather imprecise (Can you imagine designing a microprocessor with cubits?) so, over time, we've come to define units of measurement with various mathematical constants. A meter, for example is...
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