It’s mass for the masses. A tabletop device makes the new definition of the kilogram more accessible. Previously, the kilogram had been equal to the mass of a special metal cylinder kept in a vault ...

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 Kibble balance would redefine the kilogram by giving scientists the most precise measurement yet of the Planck constant. It comprises a wire coil inside a magnetic field that is suspended from the ...

The device called Kibble balance is set to replace Le Grand K. The Kibble balance tracks tiny changes in electrical current to calculate the gravitational force acting on a mass - the two components ...

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 ...

Until 2018, the SI unit of mass, the kilogram, was defined as the mass of a real object: the International Prototype Kilogram, kept in a secure facility in the outskirts of Paris. On November 16, 2018 ...

Most people know how much a pound weighs — 16 ounces. The worldly among us may know that a kilogram is 2.2 pounds — or 1,000 grams. But do we really know what these numbers mean? Agreeing on units of ...

In 2019, the International System of Units (SI) was redefined in terms of constants that relate to the natural world. This assures the future stability of the SI and opens the opportunity for the use ...

In measuring Planck's constant with the NIST Kibble balance, researchers carefully measured the effects of the magnetic field that is generated to counteract the weight of masses. In their experiments ...

Since 1889, Le Grand K, a sleek cylinder of platinum-iridium metal, has ruled from its underground vault in Paris. An absolute monarch, it was the very definition of 1 kilogram of mass. Scientists ...