1. SI Units & Scientific Notation

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

3. 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

4. SI Conversion milli- m 10-3 centi- c 10-2 kilo- k 103 mega- M 106
giga- G 109
Examples

5. 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)

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

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