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SI Units & Scientific Notation

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SI Units Why use them? Common system Easy to use -based on factors of 10

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SI Base Units What are they? Time Length/distance Mass Temperature Electric current Second (s) Meter (m) Kilogram (kg) Kelvin (K) Ampere (A) Derived Units:Volume 1 cm 3 = 1 mL

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SI Conversion milli-m10 -3 centi-c10 -2 kilo-k10 3 mega-M10 6 giga-G10 9 Examples

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Scientific Notation Why use it? Easier to write really small or large numbers Format ? x 10 n ? = number between 1 and 10 n = positive exponent (for large numbers) n = negative exponent (for small numbers)

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Scientific Notation Examples Earth’s Radius Lifetime of pion Earth to the Moon Diameter of an atom

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Homework Page 17 #1-4,6,7 Page 23 #1-2

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