1. Happy Birthday Winnie-the-Pooh (1926)

2. Nomenclature Proficiency
Average = 68.7%

3. A Few Sig. Fig. Notes
USUALLY, numbers with decimal points are MEASURED numbers
What does this mean for sig. figs.?
1 is USUALLY a DEFINED number
Put large numbers into scientific notation BEFORE rounding.

4. Types of Units Distance (length) Mass/Weight Volume Time
foot, inch, mile, yard, meter, centimeter, rod
Mass/Weight
gram, kilogram, ton, pound, ounce, stone
Volume
gallon, quart, pint, milliliter, liter, cubic centimeter (cm3, cc)
Time
second, minute, hour, year, microsecond, eon

5. Dimensional Analysis (unit conversion)
12 in =
12 in
1 ft _
1 ft
1 ft _ = 1 =
12 in
12 in
12 in
UNIT EQUATION
12 in
12 in =
1 ft
1 ft
12 in = = 1
1 ft
1 ft
1 ft
Conversion between feet and inches can be written either:
1 ft _
12 in OR
12 in
1 ft

6. Dimensional Analysis (unit conversion)
The Goal:
Convert one unit to another
How:
Use conversion factors
Use them so that
1 ft _
12 in OR
12 in
1 ft
Unit you want to keep
____________________
Unit you want to cancel

7. Dimensional Analysis (unit conversion)
How many feet are in 51.5 inches?
1 ft _
12 in
1 ft = 12 in OR
12 in
1 ft

8. The Metric System ENERGY LENGTH VOLUME TIME MASS PRESSURE
Built on BASE UNITS and PREFIXES
Base Units:
gram – g 2.35 g x10-24 g
liter – L 3.78 L 4.3x103 L
meter – m 100. m 5.29x10-11 m
second – s 135 s s
others J 755 torr
ENERGY
LENGTH
VOLUME
TIME
MASS
PRESSURE

9. The Metric System -- Prefixes
tera T
1x1012
Larger than base unit
giga G
1x109
mega M
1x106
kilo k
1x103
BASE UNIT
Listed on page 23 in the book
deci d
1x10-1
Smaller than base unit
centi c
1x10-2
milli m
1x10-3
micro m
1x10-6
nano n
1x10-9
pico p
1x10-12
femto f
1x10-15

10. The Metric System -- Prefixes
tera T
1x1012
giga G
1x109
The metric system is defined as ONE prefix is equal to a POWER OF 10 of the base unit
mega 1
Mike = M
1x106
kilo 1 g = k
1x103
BASE UNIT
deci d
1x10-1
centi 1 m = c
1x10-2
milli m
1x10-3
micro 1 L = m
1x10-6
nano n
1x10-9
pico p
1x10-12
femto f
1x10-15