1. SI UNITS & METRIC CONVERSIONS
UNIT II.2 & II.3 PPT
SI UNITS & METRIC CONVERSIONS

2. II.2 SI UNITS SI = International system of metric units.
Base unit = basic unit of measurement
(all other units are multiples of base units or combinations)
1. BASE UNITS
length = metre (m)
mass = gram (g)
time = seconds (s)
amount of substance = mole (mol)

3. II.2 SI UNITS 2. MULTIPLES OF BASE UNITS kilo = k (103)
centi = c (10-2)
milli = m (10-3)
**Table on page 17 – KNOW**
3. IMPORTANT EQUIVALENCES
1 mL = 1 cm3
1 m3 = 103 L
1 t = 103 kg

4. II.2 SI UNITS Example: Re-write the expression “6 kilograms” using
PREFIX and UNIT SYMBOLS
an EXPONENTIAL EQUIVALENT
The prefix symbol that stands for kilo is ___ and the unit symbol that stands for grams is ___
6 kilograms =
The exponential equivalent to kilo is ____
Questions: p.19 #11-14

5. II.3 METRIC CONVERSIONS
Metric conversions involve using unit conversions between prefix symbols and exponential equivalents.
Example:
Write a conversion statement between cs and s.
‘c’ stands for _____
then
Questions: p.19 #15 (odds)

6. II.3 METRIC CONVERSIONS Example: How many millimeters are in 5 km?
Unknown amount =
Initial amount =
Conversion factors =
 Combine conversion factors to make connection:
Solution

7. II.3 METRIC CONVERSIONS
Diagram (p. 20) – how prefix symbols relate to a central base unit:

8. II.3 METRIC CONVERSIONS Example 1: Express 7µm in Megametres.
Example 2: (p.21 #16e)
If 1 dL = 10-1 L and 1 kL = 103 L, how many decilitres in 0.5kL?

9. II.3 METRIC CONVERSIONS DERIVED QUANTITIES Derived quantity =
Questions: p. 21 #16,17,18,24,28
DERIVED QUANTITIES 
Derived quantity =
Derived unit =
Example on p. 23
Question: p. 21 #29

10. II.3 METRIC CONVERSIONS Example 3: Convert 1cg/ mL into dg/L Unknown:
Initial:
Conversion factors =
Solution:

11. ASSIGNMENT