The Metric System

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The Metric System

• How do we measure things in science?

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Length (measures the distance from one point to
another)

• Base Unit
• Meter

• Tool
• Meter stick/ruler

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• Meter sticks

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This lizard is 3 meters long!

• (a meter is about 39 inches)

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Volume(measures the amount of space an object
takes up )

• Base Unit
• Liter
• (liquids)
• Cubic centimeters
• (solids)

• Tool
• Graduated Cylinder (liquids)
• Ruler (solids)

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Graduated Cylinders

• Measure the volume of liquids

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Three steps to reading a graduated cylinder

1. Place the graduated cylinder on level surface
2. Read at eye level
3. Read from the bottom of the meniscus

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Formula for finding the volume of a rectangular
solid

• Length x Width x Height
• L x W x H

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Finding the volume of an irregular object

• 1. Place enough water in a graduated cylinder to
  cover the object. Record the volume.
• 2. Add the object and record the new volume.
• 3. Find the difference between the two volumes
  and that is the volume of the irregular object.

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Mass (measures the amount of matter in an object)

• Base Unit
• gram

• Tool
• Electric balance

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• Electronic balance used to measure mass

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Steps before using a balance

1. Clean the weigh pan
2. Tare the balance (zero it out)

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Temperature(measures heat and chill)

• Base Unit
• Degrees celcius

• Tool
• Thermometer

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• This man is in a freezing cold environment as can
  be seen by his frozen hair and beard. He is
  sitting in a natural hot spring that is very warm
  at the same time!

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Density

• How closely the molecules of an object are packed
  together.
• Density can be calculated if the mass and volume
  are known
• Density mass divided by volume

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• Less dense liquids
• float on more dense liquids in this density column

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Weight of an object

• The mass of an object multiplied by the force of
  gravity.
• Weight changes if gravity changes. (like on the
  moon)
• Mass does not change on the moon.
• Weight is the effect of the force of gravity on
  an object.

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Your weight will be less on the moon, but your
mass does not change