Scientific Measurement

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Scientific Measurement Conversions

• A review

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• The common language of measurements in science
  used all over the world is the metric system.
• The metric system is a decimal system or a system
  based on ten.

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Length
The meter is the basic unit length. The tool
that we use most often is the meter stick. Longer
distances would be measured in kilometers.
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Volume

• Volume is the amount of space something takes up
• The basic unit of measure for volume is Liters.
• Volume conforms to the container that contains it
  (shape)
• The tool that we use to measure liquid volume is
  called the graduated cylinder. We measure from
  the bottom of a line called the meniscus.

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• Liquid Volume is measured in milliliters (ml) or
  liters (L)
• Solid Volume is measured in cubic centimeters
  (cm3)
• For Regular Solid Volume
• Length X Width X Height
• 2cm X 3 cm X 2cm 12cm3
• For Irregular volume (no regular shape) you must
  use the volume displacement method.

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Volume Displacement Method

• place a known value in a graduated cylinder
• ( 7 ml)
• place the irregular object into the graduated
  cylinder
• measure the displacement of volume ( where did
  the liquid move up to) ( 9ml)
• Subtract the original volume from the new volume
  ( 2ml)
• Calculate the volume of the object as 2 cm3
• ( because it is a solid, not liquid)

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Mass

• the amount of matter in an object
• (different from weight weight depends on
  gravity, mass does NOT!)
• The gram is the basic unit of measure
• The tools that we use are the triple beam
  balance, electronic balance, or a scale

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Electronic Balance more precise
Triple Beam Balance counter balance system
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Density

• The measurement of how much mass is contained in
  a given amount of volume of an object
• D Mass ( measured in grams )
• Volume (mL or cm3)
• Water has a density of 1g/cm3
• Objects more than 1 will sink and objects less
  than 1 will float
• Each substance has its own unique density

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Converting Metric Units

• For metric conversions we use this acronym to
  remember the conversions
• King Henry Died By Drinking Chocolate Milk

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• Each word stands for a unit or subunit of
  measure
• King Kilo
• Henry Hecto
• Died Deka
• By grams, meters, liters (Base Unit/ Basic unit
  of measure)
• Drinking deci
• Chocolate centi
• Milk milli

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How Does It Work?
Grams Liters Meters

• K H D B d c m
• ? Greater than one 1 less than one?

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• EX 15 cm___________m
• Your known value is 15cm. You would like to
  convert that to meters. How many meters are
  equivalent to 15 cm?