The Metric System from Industry Week, 1981 November 30.
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The Metric System om Industry Week, 1981 November 30
Transcript of The Metric System from Industry Week, 1981 November 30.
The Metric System
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No Cussing!The following 4-Letter
words are forbidden here:
Inch MileFoot PintYard Acre
And we never swear the BIG F (useoC)
Please keep it clean and
Metric
SI System
• The International System of Units• Derived Units Commonly Used in Chemistry• Area and Volume: Derived Units• Prefixes in the SI System
Map of the world where red represents countries which do not use the metric system
A Common System for Trade
In 1790, the French government appointed a committee of scientists to develop a universal measuring system.
English system of measurement originated in 1215 with the signing of the Magna Carta. It attempted to bring uniform measurements to world trade.
It took ~10 years, and they unveiled the Metric system.
length meter mmass gram gvolume liter Ltime second s
The International System of Units
Length meter m
Mass kilogram kg
Time second s
Amount of substance mole mol
Thermodynamic temperatureKelvin K
Electric current amperes amps
Luminous intensity candela cd
Quantity Name Symbol
Dorin, Demmin, Gabel, Chemistry The Study of Matter , 3rd Edition, 1990, page 16
The Original Metric Reference
H2O = 1 liter
Volume
1 kg
H2O = 1 kilogram
Mass
1/10 m
1/10 m
1/10 m
= 1 meter
Length
1/10,000,000 Earth
The Official Standard Meter
The Official Standard Kilogram
Derived Units Commonly Used in Chemistry
Area square meter m2
Volume cubic meter m3
Force newton N
Pressure pascal Pa
Energy joule J
Power watt W
Voltage volt V
Frequency hertz Hz
Electric charge coulomb C
Quantity Name Symbol
Area and Volume: Derived Units
Area = length x width
= 5.0 m x 3.0 m
= 15 ( m x m)
= 15 m2
Volume = length x width x height
= 5.0 m x 3.0 m x 4.0 m
= 60 ( m x m x m)
= 60 m3
Prefixes in the SI System
Power of 10 for Prefix Symbol Meaning Scientific Notation_______________________________________________________________________
mega- M 1,000,000 106
kilo- k 1,000 103
deci- d 0.1 10-1
centi- c 0.01 10-2
milli- m 0.001 10-3
micro- 0.000001 10-6
nano- n 0.000000001 10-9
The Commonly Used Prefixes in the SI System
Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 118
