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...Physical quantities and units chapter of the textbook elementary physics this is an article from my home page www olewitthansen dk ole witt hansen contents measurement uncertainty deviations errors in measurements systematic calculation rules for absolute relative uncertainties a quantity which subject to when you write should always it as decimal number followed by unit example mass m kg where value well known examples are si other length meter km cm lysar miles yards feet kilogram g gram mg ton ounce pound tid s second h hour min year area square acre velocity speed acceleration force n newton kp kiloponds dyn older energy j joule cal calorie erg density pressure pa pascal atm mmhg bar electric current ampere ma miliampere charge c coulomb mc voltage v volt kv mv kilovolt megavolt temperature k kelvin celsius centigrades f fahrenheit science there used according more recent convention so called system international or mksa has obvious advantage contrast earlier times that everybody w...