Density

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Density
2

• What is mass? Measure of the AMOUNT OF MATTER
  making up an object. (how much stuff is in it)
• What is weight? Measure of the FORCE OF GRAVITY
  on an object. Measured in NEWTONS(N)
• How do they compare? Your weight can change
  based on location (ie. Weigh less on the moon due
  to less gravity) but your mass always stays the
  same regardless of location.
• MASS UNITS mg, g, Kg, also megagram (1000Kg)
• TRIPLE BEAM BALANCEused in the lab to measure
  mass in grams.

3

• VOLUME
• 1. The AMOUNT OF SPACE an object takes up.
• 2. The amount of space in a container
• 3. The amount of liquid in a container
• How is volume calculated?
• Dimensional volumeuse formula L x W x H
• Water displacementRead meniscus?place object in
  graduated cylinder?Read new meniscus?Subtract the
  first number from the second number.
• Units ml, L, cm3, m3
• Devices used to calculate volume graduated
  cylinder
• 1ml 1cm3 1cc

4

• Density
• 1. What is density? Measurement of how much mass
  is in a given volume.
• 2. How is density calculated? DMass
  
• 
  Volume
• 3. What is the density triangle and how is it
  used?
• Units density of a liquid g/ml, solidg/cm3
• Density of water 1g/ml
• Float?density is lt 1g/ml
• Sink? density is gt 1 g/ml
  

M
D
V
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Density DemosWhich is more dense?
SAME DENSITY
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PRACTICE PROBLEM 1

• Use the triangle to solve the following problem
  
• Determine what you are solving for
• Show the letter equation.
• Show the number equation.
• Show the triangle.
• Show the proper units in your final answer
• Calculate the Density of a brick that has a mass
  of 250 grams and a volume of 100 cubic
  centimeters.
• DM
• V
• D 250g
• 100cm3
• D 2.5g/cm3

7
PRACTICE PROBLEM 2

• Use the triangle to solve the following problem
  
• Determine what you are solving for
• Show the letter equation.
• Show the number equation.
• Show the triangle.
• Show the proper units in your final answer
• Calculate the volume of a rock that has a mass of
  100 grams and a density of 4g/cm3
• V M
• D
• V 100g
• 4g/cm3
• V 25cm3