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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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