instead of a piece of metal in France that loses weight only to put it back on again. Since 1889, the international standard for the kilogram has been a cylinder of platinum, tucked under a glass ...

6), has a mass of about 10 trillion such cylinders. But there’s nothing special about that piece of metal, and its mass ... all scientists can do is measure them. “Nobody has any idea why ...

Place the measuring cylinder on a flat surface ... A ship floats on water because the average density of the ship (the metal from which it is made, cargo, people and air contained within it ...

Just outside Paris, inside a hi-tech vault, and encased in three vacuum-sealed bell jars, rests a small metallic cylinder about the ... This small hunk of metal is the object against which all ...

Authorities in Thailand expanded their search Wednesday for a metal cylinder with ... in devices such as ones measuring humidity or the velocity of liquids. The cylinder was connected to a 56 ...