1. Unit Conversion Objectives:
Transform a statement of equality to a conversion factor
Perform unit conversion problems within the SI metric system

2. SI Prefix Conversion
Find the difference between the exponents of the two prefixes.
Move the decimal that many places.

3. move right move left SI Prefixes Prefix Scientific notation Meaning
mega (M)
106
kilo (k)
103
1 000
hecto (h)
102
100
deka (da)
101 10
Base Unit 1
deci (d)
10-1
0.1
centi (c)
10-2
0.01
milli (m)
10-3
0.001
micro ()
10-6
nano (n)
10-9
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4. Ex: How many mL are in 0.032 L? You Try! a) 20 cm = ____ m
0.032 L = _____ mL
0.032 L = mL
You Try!
a) 20 cm = ____ m
0.2 m
b) 805 dm = ____ km km
c) L = ____ mL
177 mL

5. Conversion Factors Ex: 1 dollar = 4 quarters or 4 quarters = 1 dollar
Conversion factor: a ratio from the equality between two different units that can be converted from one unit to the other
Ex:
1 dollar = 4 quarters or 4 quarters = 1 dollar
Can be written like: or
You can convert factors if you know the relationship between the unit you have and the unit you want! 

6. Dimensional Analysis Units are canceled (or “factored”) out Steps:
The “Factor-Label” Method
Units are canceled (or “factored”) out
Steps:
Identify starting and ending units.
Line up conversion factors so units cancel out.
Multiply all top numbers & divide by each bottom number.
Check units & answer.
Example will be on board

7. Practice Convert the following metric measurements:
23.0 g = _______ kg
hg = _______ g
5.312 daL = _______ L
m = _______ km
Convert each of the following using the factor label method:
How many kilometers are in 3500 meters?
How many milligrams are in 8.71 grams?
How many liters are in 20.7 dekaliters?
How many grams are in 40.3 centigrams?