The SI System of Measurement. The Nature of Measurement Part 1 - number Part 2 - scale (unit) Examples: 20 grams 6.63 x 10 -34 Joule·seconds A Measurement.

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Presentation transcript:

The SI System of Measurement

The Nature of Measurement Part 1 - number Part 2 - scale (unit) Examples: 20 grams 6.63 x Joule·seconds A Measurement is a quantitative observation consisting of TWO parts

The Fundamental SI Units (le Système International, SI)

SI Prefixes Common to Chemistry

Metric Conversions gmL Baseunit decicentimillidekahectokilo gmL Conversions in the metric system are merely a matter of moving a decimal point. The “base unit” means the you have a quantity (grams, meters, Liters, etc without a prefix.

Metric Conversions gmL Baseunit decicentimillidekahectokilo Example #1: Convert 18 liters to milliliters 18 L liters = milliliters

Metric Conversions gmL Baseunit decicentimillidekahectokilo Example #2: Convert 450 milligrams to grams mg 450 mg = g

Metric Conversions gmL Baseunit decicentimillidekahectokilo Example #3: Convert 20 kilograms to milligrams 20 kg kg = mg