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# CH 3-1 - CH 3 The Metric System Renee Y Becker CHM 1025...

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1 CH 3: The Metric System Renee Y. Becker CHM 1025 Valencia Community College

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2 The Metric System The English system was used primarily in the British Empire and wasn’t very standardized. The French organized a committee to devise a universal measuring system. After about 10 years, the committee designed and agreed on the metric system . The metric system offers simplicity with a single base unit for each measurement.
3 Metric System Basic Units

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4 SI unit SI units In 1960 International System of Units (SI) adopted This system has 7 SI base units that all other units can be derived from Metric system is a decimal system We use SI prefixes Indicates a power of 10
5 Measurement and Units Physical Quantity Name of Unit Abbreviation Mass kilogram kg Length meter m Temperature kelvin K Amount of substance mole mol Time second s Electric current ampere A Luminous intensity candela cd SI Units

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6 Metric Prefixes Unit Symbol Value meter m 1 deci meter dm 10 = 1 x 10 1 centi meter cm 100 = 1 x 10 2 milli meter mm 1000= 1 x 10 3 micro meter μ m 1 x 10 6 nano meter nm 1 x 10 9 pico meter pm 1 x 10 12 1 kilometer = 1 x10 3 meter 1 km = 1000 m
7 Measurements and Units Dimensional-Analysis method uses a conversion factor to express the relationship between units. Original quantity x conversion factor = equivalent quantity Example: express 2.50 kg lb.

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CH 3-1 - CH 3 The Metric System Renee Y Becker CHM 1025...

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