Lecture Note - Units and Calculations

# Lecture Note - Units and Calculations - Units and...

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Units and Calculations The Metric System Chemistry is an experimental science. In order for experiments to be quantitative and reproducible we need a standard set of units. The agreed upon system of measurement in the sciences is the International System , otherwise known as S.I. Units. S.I. stands for Le Systéme International. This is the metric system with which you may already be familiar. The metric system is easy to learn and use because subdivisions and multiples of the base units employ only factors of 10. Prefices indicate the size of the unit relative to the base unit. Prefix Symbol Multiple of Base Unit mega- M 1,000,000 or 10 6 kilo- k 1,000 or 10 3 deci- d 0.1 or 10 -1 centi- c 0.01 or 10 -2 milli- m 0.001 or 10 -3 micro- μ 0.000001 or 10 -6 nano- n 10 -9 pico- p 10 -12 Length The Base unit for length in the metric system is the meter. The abbreviated symbol for meters is m. A meter is slighly longer than a yard ( i.e., 1 m = 39.37 inches). Volume The Base unit for volume in the metric system is the cubic meter. The abbreviated symbol for meters is m 3 . In practice, the cubic meter is not a convenient unit for everyday use, so the cubic decimeter (dm 3 ) is used instead. Because it is so often used 1 dm 3 is given the name liter. The abbreviated symbol for a liter is L or l. When working with even smaller volumes the cubic

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Lecture Note - Units and Calculations - Units and...

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