All kilogram articles
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NewsKing of kilograms is no more as metric system gets a makeover
Metre convention countries have agreed to redefine four of the seven SI base units and link them to immutable natural constants
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NewsWhy the kilogram is changing forever
The way we decide the weight of everything on Earth is wrong
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OpinionWhat’s in a number?
Redefining the mole is more than just bean-counting – it helps people reconnect with chemistry
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NewsTextbooks need an update after mole's definition changed
Although little will change in practice, Iupac’s new definition of a mole has gained support from (almost) all sides
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NewsGame over for the original kilogram
The big K has performed admirably for over a century but all the data is in to redefine the kilogram using natural constants
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ResearchPurest silicon sphere ever created will redefine the kilogram
Largest impurity is copper taking the place of one silicon atom in every three billion
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ResearchRefining Avogadro’s number on way to new kilo
Most precise value yet reduces uncertainty down to 20 atoms in a billion