We measure stuff all the time—how long, how heavy, how hot, and so on—because we need to for things such as trade, health and knowledge. But making sure our measurements compare apples with apples has ...

For 129 years, the kilogram has been defined by a lump of metal in a French vault -- but that's about to change. Jackson Ryan was CNET's science editor, and a multiple award-winning one at that.

Deep underneath the Parisian suburb of Saint-Cloud, in a vault that can only be opened by three people wielding three different keys, there lies a hunk of metal that is so crucial to the world of ...

The NIST-4 Kibble balance, an electromagnetic weighing machine that is used to measure Planck's constant, and in turn, redefine the kilogram. Jennifer Lauren Lee / NIST Locked in a vault that requires ...

A kilo is a kilo is a kilo, right? Wrong. Monday marks World Metrology Day, and this year's edition sees a big change in the way the kilogram unit is defined. Other WRAL Top Stories In November last ...

Kevin Pimbblet receives funding from STFC and the Royal Astronomical Society. How much is a kilogram? 1,000 grams. 2.20462 pounds. Or 0.0685 slugs based on the old Imperial gravitational system. But ...