Introduction to Metric System

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Introduction to Metric System
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The Metric Scale System

• K H D S D C M
• Kilo Hecto Deca Deci Centi
  Milli
• (h) (da) (d)
  (c) (m)
• grams
• meters
• liters
• BIG SMALL

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EASY WAY TO REMEMBER

• King Henry Died Sunday Drinking Chocolate Milk

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MASS

• The amount of matter that is packed into an
  object.
• Use grams to measure mass

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GRAMS

• The Symbol g
• Measures non-liquids
• Commonly used in cooking food labeling

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What do we use to measure Grams?

• We will use a Triple Beam Balance

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How to use a Triple Beam Balance

• 1. Zero the balance
• 2. Slide all of the riders back to zero
• 3. Check the pointer (pointing to zero)
• 4. If necessary, use the adjustment screw to
  get back to zero
• 5. Place the object on the pan and move the
  riders along the beams beginning with the largest
  mass first

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How is mass different than weight?

• WEIGHT Determined by the pull of gravity on an
  object
• Note If you leave Earth
• Your weight will change
• Your mass will remain constant

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LENGTH

• The distance between two points
• Use meters to measure length

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METER

• The Symbol m
• Measures the distance between two points
• Commonly used for lengths of races

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What do we use to measure meters?

• We will use rulers

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ROUNDING

• How long is this line? Round to the nearest
  centimeter.

3.0 cm
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Nearest 10th of a centimeter

• A centimeter is divided into 10 sections on a
  ruler

This value is 1.5 cm
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How long is this line

• Measure to the nearest 10th of a centimeter

3.3 cm
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VOLUME

• The amount of 3-D space an object occupies
• Use liters to measure volume

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Liter

• The symbol L
• Measures liquids
• Commonly used for items that take up space in a
  container

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What do we use to measure Liters?

• We will use graduated cylinders and beakers

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How to use a graduated cylinder

• MENISCUS A curve in the surface of a liquid
• ALWAYS read from the bottom of the meniscus

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How to use a graduated cylinder

• 1. Place graduated cylinder on flat surface
• 2. Become eye level with the cylinder
• 3. Find the bottom of the meniscus
• 4. Record the Volume to the nearest 10th of a mL

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Read the meniscus record the volume
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Volume of objects

• We learned how to find volume of liquids
• Sometimes we want to know how much space
  non-liquids take up
• How can we find the volume of non-liquid
  objects????

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VOLUME of a REGULAR object

• A regular object has even sides
• We can easily use a ruler to measure

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FORMULA

• Volume length x width x height
• V l x w x h
• Units cm x cm x cm cm3

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Practice Regular Object 1

• Find the volume

Height 4.0 cm
Width 3.0 cm
Length 10.0 cm
Formula Substitute Answer
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VOLUME of an IRREGULAR object

• An irregular object has un-even sides
• We cannot easily use a ruler
• Use a graduated cylinder

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THE PROCESS

• 1. Place water in graduated cylinder
• 2. Find Meniscus record the volume (mL)
• 3. Add object to the water
• 4. Find the new volume record (mL)
• 5. Subtract (END - START)

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Practice Irregular Object 1

• Find the volume

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DENSITY

• How tightly the matter in an object is packed
  together

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Measuring Density

• Formula Density Mass
• Volume

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Sink or Float

• Density of water 1.0 g/cm3
• Above 1.0 SINK
• Below 1.0 FLOAT

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Density of a Regular object

• Mass 60.0 g
• Volume 120.0 cm3
• Calculate Density
• Sink or Float?

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Density of an Irregular Object

• Mass 15.0 g
• Volume 5.0 mL
• Calculate Density
• Sink or Float?