The U.S. National Institute of Standards and Technology called this Friday a “turning point for humanity,” even though the difference between this day and the day before weighs, theoretically, nothing ...

Scientists voted on Friday to redefine it based on electric currents. A replica of the International Prototype Kilogram is pictured is seen at the 26th meeting of the General Conference on Weights and ...

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 ...

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 ...

Scientists are preparing to officially update the definition of a kilogram after using an old metal prototype as the global reference for almost 130 years. Since 1889, the exact mass of one kilogram ...

Scientists are updating the definition of the kilogram, after years of nursing a sometimes dusty cylinder of metal in a vault outside Paris as the global reference for modern mass. Just as the ...

The official definition of a kilogram has been changing for well over a century, but this week it may be redefined for the final time. After years of debate and discussion, scientists from around the ...

The kilogram is getting an update. No, your bathroom scales won’t suddenly become kinder and a kilo of fruit will still weigh a kilo. But the way scientists define the exact mass of a kilogram is ...

Redefinition of the kilogram will not make the kilogram more precise, but it will make it more stable. A physical object can lose or gain atoms over time, or be destroyed, but constants remain the ...

Recent studies have shown that the kilogram may need to go on a diet because it has gained tens of micrograms of mass from surface contamination. Recent studies have shown that the kilogram may need ...