Metric System for Recording Measurments

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Metric System for Recording Measurments
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Why do we use a standard system?

• So that measurements can be consistent among
  people from all over the world
• If I measured the length of the front lab table
  using footsteps and compared this measurement to
  someone else's measurement using foot steps,
  would these numbers be the same? Why or Why not?

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SI uses the number 10 as a base- Lets look at
some units

• There are standard units for different types of
  measurements.
• Length Meters
• Mass Grams
• Volume Liters
• Temperature Celsius

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Length

• The basic unit of length in the metric system is
  the meter (m)
• The meter is to 39.4 inches

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Volume

• Volume is the amount of space an object takes up.
• The basic unit of volume is the liter (L)
• The liter is usually used for measuring the
  volume of liquids
• The volume of solids can be measured in
• cubic centimeters (cc or cm3) a cube that
  measures 1cm x 1cm x 1cm
• 1cc is exactly equal to in volume to 1 ml

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Mass

• Mass is a measure of the amount of matter in an
  object
• The basic unit of mass is the gram (g)

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Weight

• Weight is a measure of the attraction between two
  objects due to gravity
• Your weight on another planet may differ due to
  the amount of gravity, however your mass will
  always be the same

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Prefixes for our basic units

• Deci 1/10 a decimeter is 1/10 of a meter
• Centi 1/100 a centimeter is 1/100 of a meter
• Milli 1/1000 a millimeter is 1/1000 of a meter
• Kilo x1000 a kilometer is 1000x a meter
• A kilogram is 1000x a gram
• A milligram is 1/1000 of a gram

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Density

• Density is the amount of matter that occupies a
  particular space
• D Mass/Volume or D M/V
• If the substance is a solid we use g/cm3
• If the substance is a liquid we use g/ml

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Metric Prefixes used in Conversion
Kilo
Hecta
Deca
Meter / Liter / Gram
deci
centi
milli
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How can you remember this?
King
Henry
Died
Monday
Chocolate
Milk
Drinking
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How do you convert from one unit to another?

• For every space that you move you move the
  decimal one place to the left or the right

K H Da - - d c - m
M-L-G
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A Sample Problem
3450.
3.45 Kg _____g
1
2
3
K H D - - d c - m
M-L-G
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Another Sample Problem
.756
756 ml ______L
2
1
3
K H D - - d c - m
M-L-G