Measurement

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Measurement A Common Language
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The Metric System

• The metric system is a decimal system of weights
  and measures.
• It is based on the unit of length called the
  METER.
• The metric system is now called, The
  International System of Measurement (SI for
  short).
• To get the meter, they divided a line from the
  north pole to the equator into 10 million parts!

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Why do we use Metric System

• No numbers to memorize
• Easy to say and write
• Converts by multiples of 10
• Used all around the world

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Units of Measurement

• Prefixes
• Kilo 1000
• Hecto 100
• Deca 10
• (Base Unit) 1
• Deci .1
• Centi .01
• Milli .001

• Examples
• Kilometer
• Hectometer
• Decameter
• (Meter)
• Decimeter
• Centimeter
• Millimeter

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Length

• The standard unit of length in the metric system
  is the meter.
• Common length units
• 1 millimeter 1 mm
• 1 centimeter 1 cm
• 1 meter 1 m
• 1 kilometer 1km

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Lets look at the meter

• 1 meter is a little longer than 1 yard or 3 feet.
• There are 10 decimeters in 1 meter
• There are 10 centimeters in 1 decimeter.
• There are 10 millimeters in 1 centimeter

Measuring length p. 48 The shell of the turtle
in figure 2 is 8.8 cms, how many mms is this?
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English to Metric Conversions
You do not need to know these.

• 1 inch 2.54 cm
• 1 foot 30.48 cm
• 1 yard .914 m
• 1 mile 1609.3 m
• 1 mile 1.609 km

• 39,370 inches 1 kilometer
• 3280.8 feet 1 kilometer
• .62 miles 1 kilometer

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Lets Practice
Use the meter stick or the metric ruler to
measure the following careful when choosing what
unit to measure in 1. the length of your lab
table 2. the length of your science textbook 3.
the length of your partners hand 4. the length
of your own pinky finger 5. the width of your
pinky finger nail 6. the width of your pencil
point
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Mass
Mass is a measure of how much matter an object
contains. The basic unit for mass is kilogram.
How many grams 1 kg? In the science lab, we
will measure in grams. But. what is a gram?
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The difference between MASS and WEIGHT
Weight the force of gravity on an object. Mass
the amount of matter an object contains
120lbs on Earth 20lbs on the moon 50 kgs on
Earth 50 kgs on the moon
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Measuring Mass
Triple Beam Balance a device for measuring mass
in grams.
Lets learn the parts of the triple beam balance
and practice measuring mass. Desktop text p. 49
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TIME
The SECOND is the standard SI unit used to
measure time.

• There are 60 seconds in 1 minute.
• There are 60 minutes in 1 hour.

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Measuring Volume
Volume - the amount of space an object takes up.
The standard unit for volume is the
liter

• Volume of liquid pour liquid into graduated
  cylinder and measure amount
• Volume of regular shaped solids length x width
  x height in cms (cm3)
• Volume of irregular shaped solids (like a rock)
  water displacement.

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DENSITY
Density mass unit g/cm3 volume
g/ml
p. 52 Lets READ. ?
p.53 Densities of common substances. Once you
know an objects density, you can determine
whether or not the object will float in a given
liquid. Look at the chart, what is the density
of water? Will Aluminum sink or float in
water? Explain how you know
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What is the density of a pencil with a volume of
4ml, and a mass of 24g? What is the density of
an object with a volume of 12cm3, and a mass of
36g?
Lets find the Mass and Volume of our two wooden
cubes
The density of water is 1g/cm3 or 1g/ml (1ml
1cm3)