Measuring

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Measuring

• How to be
• PRECISE and ACCURATE

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Precise

• Data is close to one another

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Accurate

• Data is close to expected result

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How to Measure MASS
MASS the amount of MATTER in an object
measured in grams (gm) Triple Beam Balance
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• Place an object on the pan.
• Slide the rider with the largest mass along its
  beam until the pointer drops below zero.
• Move it back one notch.
• Repeat the process on each beam until the pointer
  stays at zero.
• Add the masses on each beam to find the mass of
  the object.

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How to Measure VOLUME
(Liquid Volume) The amount of space an item
take up measured in Liters (L)
Graduated Cylinder
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• A meniscus is the curve of the surface of the
  water in a graduated cylinder.
• Water "sticks" to the walls of the graduated
  cylinder, but only on the sides and not the
  middle. 
• When you look at the surface, the water level is
  not straight its curved like a smile. 

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• Measurement should be at the BOTTOM of the
  meniscus.
• Read the meniscus at eye level to get an accurate
  reading. 

Read the volume here
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• What is this reading?

36.5 mL
This number is an estimate
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• What is this reading?

42.9 mL
This number is an estimate
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• What is this reading?

47.0 mL
This number is an estimate
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• What is this reading?

61.2 mL
This number is an estimate
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Measuring the Volume of an Irregular Object

• Pour and record initial volume of liquid.

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25
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Measuring the Volume of an Irregular Object

• Pour and record initial volume of liquid.

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25
22.0 ml.
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Measuring the Volume of an Irregular Object

• Pour and record initial volume of liquid.
• Drop in irregular object.

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25
22.0 ml.
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Measuring the Volume of an Irregular Object

• Pour and record initial volume of liquid.
• Drop in irregular object.
• Measure the final volume
• of liquid in the graduated
• cylinder.

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26.0 ml.
25
22.0 ml.
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Measuring the Volume of an Irregular Object

• Pour and record initial volume of liquid.
• Drop in irregular object.
• Measure the final volume
• of liquid in the graduated
• cylinder.
• Subtract the initial volume
• from the final volume.

30
26.0 ml.
25
22.0 ml.
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Measuring the Volume of an Irregular Object

• Final Volume 26.0 ml
• Initial Volume - 22.0 ml
• Volume of object 4.0 ml

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Length

• Length the distance from one point to another
• Measured in Meters
• Tool Meter stick

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How to Measure LENGTH
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• Most metric rulers have lines indicating
  centimeters and millimeters.
• The centimeter lines are the longer, numbered
  lines.
• The shorter lines are millimeter lines.
• When you use a metric ruler, line up the
  0-centimeter mark with the end of the object
  being measured.

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How to measure using millimeters and centimeters
The smallest tick mark is a millimeter (mm)
10 millimeters 1 centimeter (cm)
100 millimeters 1 decimeter(dm)
1000 millimeters 1 meter
Millimeter (mm)
Centimeter (cm)
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KILO1000Units
HECTO100Units
DEKA10Units
DECI0.1Unit
CENTI0.01Unit
MILLI0.001Unit