-- > The provisional kilogram standard had been fabricated in accordance with a single, inaccurate measurement of the density of water made earlier by Antoine Lavoisier and Ren?Just Ha�y, which showed that one cubic decimeter of distilled water at 0�C had a mass of 18, 841 grains in France's soon-to-be-obsoleted " poids de marc " system.
42.
It is equal to molar concentration at 0 �C, i . e ., 1 D represents one mole of the solute present in one cubic decimeter of the solution at 0 �C . It was first proposed in 1924 as a unit of concentration based on the decimeter rather than the liter; at the time there was a factor of 1.000028 difference between the liter and the cubic decimeter.
43.
It is equal to molar concentration at 0 �C, i . e ., 1 D represents one mole of the solute present in one cubic decimeter of the solution at 0 �C . It was first proposed in 1924 as a unit of concentration based on the decimeter rather than the liter; at the time there was a factor of 1.000028 difference between the liter and the cubic decimeter.
44.
It is equal to molar concentration at 0 �C, i . e ., 1 D represents one mole of the solute present in one cubic decimeter of the solution at 0 �C . It was first proposed in 1924 as a unit of concentration based on the decimeter rather than the liter; at the time there was a factor of 1.000028 difference between the liter and the cubic decimeter.
45.
In this equation, ? ( Greek letter " alpha " ) is the measured rotation in degrees, " l " is the path length in decimeters, " c " is the concentration in g / mL, " T " is the temperature at which the measurement was taken ( in degrees Celsius ), and " ? " is the wavelength in nanometers.
46.
Thus, a cubic decimeter of water at its point of maximum density is only 25 parts per million less massive than the IPK; that is to say, the 25 milligram difference shows that the scientists over years ago managed to make the mass of the Kilogram of the Archives equal that of a cubic decimeter of water at 4 �C, with a margin of error " at most " within the mass of a single excess grain of rice.
47.
Thus, a cubic decimeter of water at its point of maximum density is only 25 parts per million less massive than the IPK; that is to say, the 25 milligram difference shows that the scientists over years ago managed to make the mass of the Kilogram of the Archives equal that of a cubic decimeter of water at 4 �C, with a margin of error " at most " within the mass of a single excess grain of rice.
48.
-- > That same year, 1799, an all-platinum kilogram prototype was fabricated with the objective that it would equal, as close as was scientifically feasible for the day, the mass of one cubic decimeter of water at 4�C . The prototype was presented to the Archives of the Republic in June and on December 10, 1799, the prototype was formally ratified as the " kilogramme des Archives " ( Kilogram of the Archives ) and the kilogram was defined as being equal to its mass.
