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Would that be the 14 cubic metre displacement ton, based on the volume occupied by one metric ton of liquid hydrogen, the 500 cubic feet displacement ton also based on the volume occupied by one metric ton of liquid hydrogen or the 13.5 cubic metre displacement ton based on the size of a deck plan square on ship deck plans :devil:
The kilogram is currently "based on the exact weight of a golf-ball-sized chunk of platinum and iridium stored under three glass bell jars in a vault in an ornate building outside of Paris." This defines mass internationally.
This standard chunk of metal has lost a tiny bit of material, and people don't know why. This makes the universe "heavier," by our lame definition.
Today (11/16), scientists meet in Versailles, France, to discuss a new definition.
Maybe a "Kibble balance," which uses magnetic/electrical measurements and laser interferometers to get at a measure of mass in a sideways fashion.
The new kilogram will be announced on World Metrology Day this year, May 20, 2019.