1. Scientific Notation Units Conversion Factors
Measurements
Scientific Notation
Units
Conversion Factors

2. Scientific Notation An easy way to write small and large numbers.
The number before the decimal is between 1 and 10.
The numbers (if any) after the decimal are signficant figures
m = 5.0 X 10-5m
9,600,000m = 9.6 X 106m

3. Scientific Notation Using a scientific calculator: Use the EE button
4.58 x 106 is typed 4.58 EE 6
Using a graphing calculator:
Use the EXP button
4.58 x 106 is typed 4.58 EXP 6

4. Units of Measure English System International System (SI)
Not used as often anymore
International System (SI)
SI units based on the metric system
Used by scientific community

5. SI Base Units Physical Quantity Unit Name Abbreviation
Mass kilogram kg
Length meter m
Time second s
Temperature kelvin K
Amount of substance mole mol
All other units are derived units -- combinations of base units

6. Derived Units Volume: the amount of space a substance occupies.
1dm3 = 1 liter
1cm3 = 1milliliter (mL)

7. Metric Prefixes Prefix Symbol Multiplier Exponential mega M 1,000,000
106
kilo k
1000
103
hecto h
100
102
deca da 10
101
deci d
0.1
10-1
centi c
0.01
10-2
milli m
0.001
10-3
micro
10-6
nano n
10-9

8. Equivalence Statements
The relationship between 2 units of measure.
Ex: 1 m = yd
What conversion factors can you get from this equivalence statement?

9. Dimensional Analysis Convert from one unit to another
Conversion Factor: ratio of the two parts that relates the two units
Make sure the desired unit is in the numerator and remaining units cancel out
500m = ? cm
500m x 100cm 1m

10. Certain or Uncertain?
The book