1. Conversions
The universally accepted system of measurement is the SI System, the System Internationale d’Unites, or the International System, also known as the metric system. The metric system is based on the unit ________.

2. Base Units of Measurement
Symbol
Length/Distance
meter m
Mass
gram g
Temperature
Kelvin K
Volume
liter L
Time
second s
Energy
Joule J
Speed
meter per second
m/s
Frequency
1/second Hz
Density
grams/milliliter
g/mL
Pressure
Pascal Pa

3. Practice!! Number Measurement 0.00965 kg mass 940500 Mm 409000000 psJ Pa
5.600 g/mL mL kJ mg
600 K
0.01 km

4. How the Base Unit Works 103 100 10-2 10-3 10-6 1000 1 0.01 0.001
Kilo
Base Unit (m, l, g, etc)
Centi
Milli
Micro

5. SI Prefixes Prefix Symbol Meaning Mega M 106 Kilo k 103 Base -- 100
centi c
10-2
milli m
10-3
micro
10-6
nano n
10-9
pico p
10-12

6. SI Unit Conversions Convert 3450 cm to km. 3450 cm 1 km
= 3450 x 10-5 km or 3.45 x 10-2 km
105 cm
Convert g to mg. g
106 mg
= x 106 mg or 3.6 x 103 mg 1 g
Convert 8.9 x 10-8 s to ps.
8.9 x 10-8 s
1012 ps
= 8.9 x 104 ps 1 s

7. Practice with Conversion
Convert the following:
23.2 m = ______ cm
93.71m = ______ km
920,000 µm = _________m
3.6 x ML = _________ L
1.41 x 1014 pg = ________g
16.0 ns = ________ s

8. Practice with Dimensional Analysis
In Raiders of the Lost Ark, Indiana Jones tried to remove a gold idol from a booby-trapped pedestal. He replaces the idol with a bag of sand. If the idol has a mass of 2.00 kg, how many litres of sand must he place on the pedestal to keep the mass sensitive booby-trap from activating? (Density of sand is 3.00 g/cm3)

9. Practice with Dimensional Analysis
At a given point in its orbit, the moon is 2.4 x 105 miles from earth. How long does it take light from a source on earth to reach a reflector on the moon and then return to earth? (speed of light is 3.0 x 108 m/s) Conversions: 1 mi- 5280ft cm = 1in.