si unit

1
SI Units

• Notes Green

2
The basics

• What is SI?
• SI stands for Le Système international d'unités
  or The International System of Units.
• SI units are used throughout the world except in
  the United States and some of the United Kingdom.

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What are the SI units?

• There are 4 major types of measurements
• Length
• Mass
• Volume
• Temperature

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What are the units?!

• Length Length is measured in METERS
• Mass Mass is measured in GRAMS
• Volume Volume is measured in LITERS
• Temperature Temperature is measured in KELVIN
  (Celsius is sometimes used instead)

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SI vs English

• The English system is what we are probably more
  familiar with. English units for the same
  measures are
• Length inches/feet/yards/miles
• Mass ounces/pounds/tons
• Volume fluid ounce/cups/quarts/gallons
• Temperature Fahrenheit/Celsius

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Why use SI?

• There is one key advantage of SI over English.
• Metric (SI) units work in 10s, therefore it is
  very easy to convert from big units to small
  units and vice versa.
• English units are not easy to convert. Can you
  easily convert one mile to inches?

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Moving between units

• To change from one unit size or type to another
  is called a conversion.
• To help us learn conversions you will want to
  familiarize yourself with this saying
• King Henry Died _ drinking chocolate milk

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Say What?

• King Kilo (meaning 1000)
• Henry Hecto (meaning 100)
• Died Deca (meaning 10)
• _ the base unit (1)
• drinking deci (meaning 1/10)
• chocolate centi (meaning 1/100)
• milk milli (meaning 1/1000)

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And their symbols/abbreviations
Name kilo- hecto- deca-
Symbol k h da
Factor 103 102 101
Name deci- centi- milli-
Symbol d c m
Factor 10-1 10-2 10-3
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Life examples

• Create this chart in your notebook to take up a ½
  page.

Kilo- (k) (base) milli- (m)
Gram (g)
Liter (L)
Meter (m)
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Fill it out!

• Take the next 10 minutes to think of items you
  could measure using each box!
• Helpful starters
• 1 gram 1 paperclip
• 1 liter 1 bottle of water
• 1 meter 1 meter stick