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...Unit measurements physical quantities and si units a quantity consists of numerical magnitude e g ms the international system is common that scientists from all over world agree upon are classified into base name length metre m mass kilogram kg time second s temperature kelvin k current ampere amount substance mole mol b derived relation with symbol for area x width speed distance or density volume kgm www calvinkongphysics com prefixes useful expressing either very big small some their symbols to indicate decimal sub multiples factors factor giga mega kilo deci d centi c milli micro nano n example nm scalars vectors scalar has but no direction work energy power pressure vector displacement velocity acceleration force moment torque added using methods see forces tip tail parallelogram trigonometry...