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Experts Suggest Replacing Definition of Kilogram
fenimor writes "The kilogram is the only one of the seven basic units of the international measurement system defined by a physical artifact rather than a natural phenomenon. International team of scientists suggest replacing the kilogram artifact -- a cylinder of platinum-iridium alloy about the size of a plum --with a definition based on one of two unchanging natural phenomena, either a quantity of light or the mass of a fixed number of atoms. They propose to adopt either one of two definitions for the kilogram by selecting a specific value for either the Planck constant or the Avogadro number."
There are a couple of issues here. First, one liter of water at what temperature? Water does expand slightly as temperature increases. Second, how accurately can you measure one liter? Lastly, one litre of water doesn't weight exactly a kilo, it's like 0.99998 kilos.
A deep unwavering belief is a sure sign you're missing something...
(504 gallons per mile)
always mosh clockwise
Even though the kilogram cylinder is housed in a special vault under controlled conditions at the BIPM, its mass can drift slightly over the years and it is subject to changes in mass because of contamination, material loss from surface cleaning, or other effects.
I always thought, that the mass of 1 Liter of water could fill a cube of 1dm, being 1kg. Or am I wrong with assuming that?
Or rather, would changing the globally agreed "Kilo" change as well what we consider as a "Liter"?
I think we can keep recursing like this until someone returns 1
My car gets forty rods to the hogshead, and thats the way I likes it!!
I suppose a more appropriate quote would be:
"My car weights 175 stones, and that's the way I likes it!"
All I know is, my car gets 10 rods to the hogshead, and that's the way I likes it!