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alpha particle arbitrary definition atmospheric pressure available secondary standards B. F. LUDOVICI basic dimensions basic farad basic four dimensions basic meter basic newton basic ohm basic second basic system basic units change-over changing primary standards coefficient coul coulomb curacy decimeter derived quantities different dimension length electric current electron example exception of easy four significant figures fourth standard free space funda fundamental quantities gram gravitation constant improved experimental technique inherent inaccuracy international prototype meter international system kg-1 sec2 coul2 mass unit value mean solar day mental quantities ments meter per basic mksc units natural law number of significant numerical value periodic recalibration permeability of free PHYSICAL UNITS present metric system present mksc system present standards present system prototype kilogram red cadmium line reproducible significant zeros specific density standard cells Stanford University system of physical system of standards systematic error unit definition unit mass UNITS AND STANDARDS unity velocity of light voltage