Measurement

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Measurement

• Science 7
• Ms. Drake
• Brookville Intermediate School

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Measurement

• A way to describe objects and events with
  numbers quantitative description.
• Standards of measurement needed to be universal
  they need to be agreed upon by people all over
  the world.
• Every measurement has a number and UNIT!!

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English System vs Metric System
English System Metric System
Length Inches, Feet Meters
Volume Gallons, Pints, Quarts, Ounces, Cups Litters
Mass Pounds, Tons Grams
Temperature Fahrenheit Degree Celsius or Kelvin
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International System- SI

• Metric system
• Easier to use than the standard English system
• System represents multiples of 10 DO NOT use
  fractions
• Some units include meter, kilogram, liter, and
  second

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Linear System

• Length, Width, Height
• Tools Ruler, Meter Stick, Tape Measurer
• Unit METER

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Linear System

• For Solid Regular Objects
• Perimeter- distance around the object (meter)
• Area- length width (meter squared)
• Volume- length width height (meter cubed)
• Circumference- distance around a circle (meter)

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Volume

• How much space matter
• occupies
• Tools (liquid) Graduated Cylinder, Beaker, Flask
• Unit LITER

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Using a Graduated Cylinder

• Water in a graduate has a curved surface called
  the meniscus. You always read the graduated
  cylinder at eye level.

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Hint

• Always check the unnumbered marks on a graduate
  to see how many sections there are and what they
  measure.

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Volume of Irregular-Shape Objects

• We use a method called water displacement to
  determine their volume. Displacement is the
  change in the height of water when a non-regular
  shape is added.
• Put some water in a graduate. Record the volume
  of the water. This is your initial volume.

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• Carefully slide the object into the graduated
  cylinder and record the new volume level. This is
  your final volume.
• Subtract the initial volume from the final volume
  and you have the volume of the object.

Initial Volume
Final Volume
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Mass

• The amount of matter an object has
• Tools Balance, Scale
• Unit GRAM
• Use a triple-beam balance to measure an objects
  mass.

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Time

• How long it takes an event to happen
• Tools Stop Watch or Clock
• Unit HOURS, MINUTES, SECONDS

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Temperature

• The measure of how hot or cold something is
• Tools Thermometer
• Unit C
• H20 freezes at 0 degrees Celsius and boils at 100
  degrees Celsius.

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Tools of the Trade
Measurement device Dimension of measurement
Beaker Volume
Stopwatch Time
Balance Mass
Graduated cylinder Volume
Meter stick Length, width, height
Thermometer Temperature
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Density

• Density is a comparison of how much matter there
  is in a certain amount of space.
• People in a square Which square is more dense?

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• Now which one is more dense?

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What is Density?

• Density mass OR mass volume.
• volume
• Units for density g .
• cm3

ALWAYS REMEMBER UNITS!
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Lets try a density problem together. . .

• Frank has a paper clip. It has a mass of 9 g and
  a volume of 3 cm3. What is its density?
• Frank also has an eraser. It has a mass of 3 g,
  and a volume of 1cm3. What is its density?

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Work on these problems with your table group. . .

• Jack has a rock. The rock has a mass of 6 g and a
  volume of 3 cm3. What is the density of the rock?
• Jill has a gel pen. The gel pen has a mass of 8 g
  and a volume of 2 cm3. What is the density of the
  rock?

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Try these on your own. . .

• AlLicia has a watch. It has a mass of 4 g and a
  volume of 2 cm3. What is the density of the
  watch?
• Mia has a wallet. It has a mass of 15 g and a
  volume of 5 cm3. What is the density of the
  wallet?

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Liquid Layers

• If you pour together liquids that dont mix and
  have different densities, they will form liquid
  layers.
• The liquid with the highest density will be on
  the bottom.
• The liquid with the lowest density will be on the
  top.

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Liquid Layers

• Which layer has the highest density?
• Which layer has the lowest density?
• Imagine that the liquids have the following
  densities
• 10g/cm3. 3g/cm3.
• 6g/cm3. 5g/cm3.
• Which number would go with which layer?

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Liquid Layers- Try with your neighbor

• Which liquid has the highest density?
• Which liquid has the lowest density?
• Which liquid has the middle density?

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Liquid Layers- Now try on your own!

• Imagine that the liquids on the right have the
  following densities
• 15g/cm3 10g/cm3
• 3g/cm3 9g/cm3
• 7g/cm3 12g/cm3
• Match the colors to the correct densities