1. THE METRIC SYSTEM

2. Why Metrics?
Scientists needed a system of units to report data that was universal
SI Units – Systéme Internationale d’Unites
French origin
Modern form of the metric system

3. Base Units A defined unit in a system of measurement
Independent of other units
There are 7 of these in the metric system
Can you think of any other units?
Quantity
Base Unit
Symbol
Time
Length
Mass
Temperature
Amount of a substance
Electric current
Luminous intensity
Second s
meter m
kilogram kg
Kelvin K
mole mol
ampere A
candela cd

4. Derived Units Defined by a combination of base units
What are some common derived units that you can think of?
Quantity
Derived Unit
Symbol
Base Units
Solids:
Liquids:
Speed
Volume
Force
meters/second
m/s length/time
cubic meters
m³ (length)³
liters
L 1dm³
N 𝒌𝒈 ∙𝒎 𝒔 𝟐
Newton

5. SI Unit Prefixes PREFIX SYMBOL VALUE Giga Mega Kilo Hecto Deca
(Base Unit)
Deci
Centi
Milli
Micro
Nano
Pico
G 𝟏𝟎 𝟗 =𝟏 𝒃𝒊𝒍𝒍𝒊𝒐𝒏
M 𝟏𝟎 𝟔 =𝟏 𝒎𝒊𝒍𝒍𝒊𝒐𝒏
k 𝟏𝟎 𝟑 =𝟏𝟎𝟎𝟎
h 𝟏𝟎 𝟐 =𝟏𝟎𝟎
dk 𝟏𝟎 𝟏 =𝟏𝟎
m, g, s, L 𝟏𝟎 𝟎 =𝟏
d 𝟏𝟎 −𝟏 =𝟎.𝟏
c 𝟏𝟎 −𝟐 =𝟎.𝟎𝟏
m 𝟏𝟎 −𝟑 =𝟎.𝟎𝟎𝟏
µ 𝟏𝟎 −𝟔 =𝟏 𝒎𝒊𝒍𝒍𝒊𝒐𝒏𝒕𝒉
n 𝟏𝟎 −𝟗 =𝟏 𝒃𝒊𝒍𝒍𝒊𝒐𝒏𝒕𝒉
p 𝟏𝟎 −𝟏𝟐 =𝟏 𝒕𝒓𝒊𝒍𝒍𝒊𝒐𝒏𝒕𝒉

6. Mnemonic Devices G M k h dk (bu) d c m µ n p
Good Models Know How Dunkin Donuts Can Make U Not Petit
Great Mighty King Henry Died By Drinking Chunky Milk, Nes Pa?
Nes Pa? = Didn’t He?