The kilogram isn't a thing anymore. Instead, it's an abstract idea about light and energy. As of today (May 20), physicists have replaced the old kilogram — a 130-year-old, platinum-iridium cylinder ...

The official US kilogram — the physical prototype against which all weights in the United States are calibrated — cannot be touched by human hands except in rare circumstances. Sealed beneath a bell ...

The kilogram is losing weight and many scientists agree that it's time to redefine it. They are hoping to redefine the kilogram by basing it on standards of universal constants rather than on an ...

The other day, I did something I am dispatched to do every now and then: bought a kilo of basmati rice. It came nicely packaged in a sealed bag. It feels about what I think a kilogram should feel like ...

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 ...

Grams (g) and kilograms (kg) are used to describe measurements of mass. Grams are used for smaller or lighter items. 1,000 grams are equal to 1 kilogram. You can write it like this: 1,000 grams = 1 ...