SI System of Measurement - PC\|MAC

SI System of Measurement (known commonly as the metric system) Background The English system of measurement originated in 1215 with the signing of the Magna Carta. It attempted to bring uniform measurements to world trade. In 1790, the French government appointed a committee of scientists to develop a universal measuring system. It took ~10 years, and they unveiled the metric system. Property Unit

abreviation length meter m mass gram g volume liter L time second s quantity of matter mole

mol The International System of Units (Systeme International dunites) was developed in 1960 from the older system. It is the worlds most widely used system of units, both in commerce and science. A notable exception is the United States, which still uses many old units in addition to SI. SI Base Units in Chemistry Quantity length mass time

amount of substance temperature Name Symbol meter m kilogram kg second s mole mol Kelvin K

The Original Metric Reference H2O 1 kg = 1 liter 1/10,000,000 Earth Volume = 1 meter Length H2O

1/10 m 1/10 m 1/10 m Mass = 1 kilogram Area and Volume: Derived Units Area = length x width = 5.0 m x 3.0 m = 15 ( m x m) = 15 m2 Volume = length x width x height = 5.0 m x 3.0 m x 4.0 m

= 60 ( m x m x m) = 60 m3 Prefixes in the SI System Prefix x base unit Symbol equals base units Sci. notation Mega- dollar 1 Md = 1,000,000 dollars = 1x 106 kilo- dollar 1kd = 1,000 dollars = 1x 103 hecto- dollar 1 hd = 100 dollars = 1x 102 deka- dollar 1 dad =

10 dollars = 1x 101 dollar 1 dollar = 1 dollar base unit equals prefix x base unit Symbol 1 dollar = deci-dollars 10 dd 1 dollar = centi-dollars 100 cd 1 dollar = milli-dollars 1 000 md 1 dollar = micro-dollars 1 000 000 d

= 1x 100 Sci. notation 1x 101 1x 102 1x 103 1x 106 Conversion of SI Units Use equivalencies to convert units. Always make the bigger unit 1 and convert back to the base unit. M k h

da - d c m n For example: 3 km ______m___________cm__= ____ cm km

m 3 km 1000 m 1 km 100 cm = 300 000 cm 1 m s.n.= 3 x 105 cm Likewise:

2.5 mm 1 m 1 000 mm 1 dam = .00025 dam 10 m s.n.= 2.5 x 10-4 dam

Try this one ! Convert 2.5 dg_______________= ___________ng

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