SI Measurement

1
SI Measurement

• Le System international dUnites
• Internationally agreed
• 75 000 not 75, 000
• Meters not miles
• Liters not gallons

2
Units?

• mass
• length
• Volume
• Time
• Amount of a substance

3
Other Units

• Derived unit combination of units like in
  velocity m/s2, or pressure kg/m s2
• Density g/cm

4
Density

• D m/v
• Ratio of mass to volume
• The mass divided by the volume
• Physical property

5
Mass

• kilogram is the standard
• 1000 grams
• We use grams more useful in science class.
• King Henry Chart
• Remember
• Mass measure of matter, does not depend on
  gravity
• Weight measure of the gravitational pull on the
  mass

6
Mass and weight

• mass is the amount of matter and will not change
  with location
• Weight is a measure of gravity and will change
  with location

7
How to convert

• King Henry chart memorize
• King Henry drank uho delicious chocolate milk
• Kilo Hecto daka ______deci centi milli

8
Larger prefixes

• Mega
• Giga
• tera

9
Smaller prefixes

• Micro
• Nano
• Pico
• Femto
• atto

10
Multiple conversions

• Affects density, area etc
• If the unit is squared, you need to convert
  twice.
• If the unit is cubed you need to convert
  _______________

11
Practice

• Pg 60. 31-34