1. Measurement CPO Science
Chapter 1
Measurement
CPO Science

2. Measurements A measurement has two parts: 1. a number value
Examples: 12, 3, 432, etc.
2. a unit
Examples: meters, seconds, ninth graders

3. Two Systems of Measurement
English (“American”) System - used for everyday measurement in the United States
International System of Units or Metric System - used for everyday measurement in most other countries and for scientific measurements

4. The Metric System Base unit of length Base unit of mass
Base unit of volume

5. Converting in the Metric System
Move the decimal point:
Move decimal to the right
Move decimal to the left

6. Easy Way to Remember
King
Henry
Drank
Ucky
Dark
Chocolate
Milk

7. The Metric System
Prefixes to memorize: yellow packet p. 2
List the 4 prefixes in order of size, starting with the smallest:
milli < centi < [base unit] < kilo

8. The Metric System Summary
milli < centi < [base unit] < kilo
Example:
0.001 kilometer
= ? meter
= ? centimeters
= ? millimeters

9. Converting in the Metric System
SIZE compared to base unit
NUMBER compared to base unit
Example
kilo-
(k)
[base unit]
centi-
(c)
milli-
(m)
1000x larger
1000x smaller
5 km=5000 m
equal
equal
equal
100x smaller
100x larger
1200 cm=12 m
1000x smaller
1000x larger
8 mm=0.008 m

10. Accuracy and Precision
Accuracy: how close a measurement is to the accepted, true value
Precision: how close repeated measurements are to one another

11. Accuracy and Precision
Are the pictures below accurate, precise, accurate and precise, or neither? 1 3 2 4