New measurement will help redefine international unit of mass

Using a state-of-the-art device for measuring mass, researchers at the National Institute of Standards and Technology (NIST) have made their most precise determination yet of Planck's constant, an important value in science ...

Researchers developing a new balance for the new kilogram

Technische Universität Ilmenau and the Physikalisch-Technische Bundesanstalt (the National Metrology Institute of Germany) are developing a balance which is required for measuring the redefined kilogram that will be introduced ...

Redefining the kilogram at NPL

Researchers from the National Physical Laboratory (NPL) are working with scientists across the globe to redefine the SI unit of mass, the kilogram, as part of a major revision of the SI base units. NPL has recently published ...

Important milestone reached on road to a redefined kilogram

In a secure vault in the suburbs of Paris, an egg-sized cylinder of metal sits in a climate-controlled room under three glass bell jars. It is the mass against which all other masses in the world are measured - by definition ...

SI Superheroes return with another weighty adventure

The nefarious Major Uncertainty has kidnapped Monsieur Kilogram, putting the world's measurements of mass in jeopardy. As the world spirals into "Mass Hysteria," the remaining SI Superheroes, champions of the metric system, ...

Kilogram celebrates its 125th birthday

The IPK has been the global standard for mass for the last 125 years; it was sanctioned at the first General Conference on Weights and Measures (CGPM) on 7-9 September 1889 in Paris. This is likely to be the last landmark ...

Vacuums provide solid ground for new definition of kilogram

Of all the standard units currently in use around the world, the kilogram – the official unit of mass in the International System of Units (SI) – is the only one that still relies on a physical object for its definition. ...

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