Âé¶¹´«Ã½

The kilogram is dead. Long live the kilogram

This video is subscriber-only

The kilogram is dead. Long live the kilogram

For decades, the kilogram has been defined by a lump of metal in Paris. It’s time for a makeover, say Ian Robinson and Perdi Williams of the UK’s National Physical Laboratory.

Topics:

Sign up to our weekly newsletter

Receive a weekly dose of discovery in your inbox. We'll also keep you up to date with Âé¶¹´«Ã½ events and special offers.

Sign up

To continue reading, today with our introductory offers

or

Existing subscribers

Sign in to your account
Piano Exit Overlay Banner Mobile Piano Exit Overlay Banner Desktop