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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? Second (s) Time Meter (m) Length/distance**

Kilogram (kg) Kelvin (K) Ampere (A) What are they? Time Length/distance Mass Temperature Electric current Derived Units: Volume 1 cm3 = 1 mL

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**SI Conversion milli- m 10-3 centi- c 10-2 kilo- k 103 mega- M 106**

giga- G 109 Examples

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**Scientific Notation Why use it? Format**

Easier to write really small or large numbers Format ? x 10n ? = 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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Numbers and Measurement measurements often very small or very large to handle these numbers, we use scientific notation.

Numbers and Measurement measurements often very small or very large to handle these numbers, we use scientific notation.

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