1. Science and Measurements
Chapter 1
Science and Measurements

2. Measurement Systems:
1. English system (or U.S. customary units) - used in U.S.
2. SI system (or Metric system) - used worldwide.

3. International System of Units SI system (Metric system)
Established in France 1790
1960 revised for international scientific agreement.
SI is simple because it is based on factors of 10.

4. Categories of Units:
A) Base Units - based on a physical constant. Ex/ meter, gram
B) Derived Units - come from base units. Ex/ area, volume

5. 7 Base Units Quantity Measured unit symbol 1. Length meter m
2. Mass gram g
3. Time second s
4. Electric current ampere A
5. Temperature Kelvin K

6. 6.Amount of substance mole mol
7. Luminous intensity candela cd
(light)

7. SI Prefixes:
k kilo x’s
h hecto x’s
da deka x’s
Base units (m,g,s,mol,cd,A,K)
d deci /10
c centi /100
m milli /1000

8. Remember this sentence:
King Henry’s daughter begins dance class Monday.
K h da B d c m
Ex/ g = ____________ cg
Ex/ dag = __________ kg

9. Practice

10. THE END