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Is there a new kilogram? Yes and no. A kilogram is still 1,000 grams, but how do you know if a kilogram in your country weighs as much as a kilogram in another country? In the late 1800s, a group of countries agreed to use a standard weight. They made a perfect kilogram and called it “Le Grand K.” They kept it in Paris. It became the standard, and other countries made copies from it. There was a problem, however. Somehow, the weight of Le Grand K changed. Now scientists have found a new way to measure a kilogram. They don’t need Le Grand K any more. There is a new kilogram. (by Prof. Douglas Jarrell)
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