1. The Metric System Conversions Measurement Significant Digits Graphing
CHAPTER 2
The Metric System
Conversions
Measurement
Significant Digits
Graphing

2. Measure The Room Lab
Measure the length and width of the room in “shoe” units.
Discuss differences.
Why doe we use standards?
Name US units volume, distance, …etc
Name Metric “Base” units.
Name Metric prefixes
Place prefixes in order smallest to largest.

3. 2.1 The Metric System and SI
Why use the Metric System
Based on powers of 10, convenient to use
The Syste’me Interationale d’Unite’s =
SI = The Metric System
This is the standard system used throughout the world by scientists, engineers, and everyone else everywhere except US.

4. Metric Prefixes Name as many metric prefixes as you can
Now place them in order from smallest to largest
Give students correct order

5. Why don’t we use the Metric System in the United States?
Good question.

6. Base Units Length = meter (m) Mass = gram (g) → “standard” unit = kg
Volume = liter (l)
Time = second (s)
Temperature = Kelvin (K)
Amount of a substance = mole (mol)
…etc

7. Definition of a kilogram
The mass of a small platinum-iridium metal cylinder kept at a very controlled temperature and humidity.

8. Definition of a meter
The distance traveled by light in a vacuum during a time interval of 1/ seconds.

9. Definition of a second
The fraquency of one type of radiation emitted by a cesium-133 atom.

10. SI Prefixes Giga – G 109 1 000 000 000 Mega –M 106 1 000 000
kilo – k
hecto – h
deka – da
BASE UNIT meters/liters/grams/…etc
deci – d
centi – c
milli – m
micro – μ
nano – n
pico – p

11. Introduction to meter stick
Meter (m) – dm – cm – mm
Demonstration with meter sticks #1, #2, #3, plus standard meter stick.

12. METRIC “STEP” SYSTEM & CONVERSIONS
Convert 102m → mm
102m = mm
Convert μm → m
μm = m
Metric Conversion Hand Out #1

13. Handout #1

14. METRIC “Step System” μ m c p m c p m c p G M k da h d n G M k da h d n
BASE d m c n p G M k da h
BASE d m c n p G M k da h
BASE d m c n p
For each step you go up, move the decimal point one place to the left.
For each step you go down, move the decimal point one place to the right. μ

15. Handout #2 Handout Metric Conversion Quiz 17-points (OPTIONAL)
Handout Metric Conversion Worksheet 1-24 (OPTIONAL)

16. Conversions Cont. Length 1 inch = 2.54 cm (exactly)
Volume 1 liter = qt
Mass 1 kg = 2.21 lbs
Weight 1 lb = 4.45N (Newtons)
More useful conversions on back cover of text book

17. Dimensional Analysis Method = Factor Label Method
Example #1
4km → in
4km x 1000m x 100cm x 1in =
km m cm in

18. Example #2 26dam → yds 26dam x 1000cm x 1in x 1ft x 1yd =
dam cm 12in 3ft
284.3yds

19. More Example Problems 3) 37hl → gal 37hl = 978.28gal
4) mg → tons
mg = tons

20. 5) oz → Gg
oz = 13,269.16Gg
6) mg → tons
mg = 1.03tons
Hint:
Insert the units first to ensure that the units will cancel out leaving only the unit that you want to end up with.

21. Additional Handouts Handout #3 Handout#4 Handout#5
Handout – Conversion Handout-1