I love the fact that it is a "standard teapot."  We should store it next to the kilogram standard so that we can always have a reference to what an official teapot is!  Great stuff Tom!,(reply>), @Paul Connor But the point was that this teapot is universally known, not just in the UK.,(reply>), "How long was your jog today?"<br>"Oh about 4 kilo-teapots",(reply>), I'll send a petition to the White House so we can make it an official unit of measurement here in America.,(reply>), @John Gilmer It never was. The earth is not an exact sphere, so gravity varies ever so slightly depending on where on earth an object is being weighed. Similar to the boiling point of water, which varies depending on altitude.,(reply>), @cakeman58 --  Well, it was!