DENSITY
Mr. Bantay - Oceanography
LAB OVERVIEW: Density
• The Earth is
structured
on the basis
of DENSITY
What is Density?
• Density is described as the amount of matter
within a given amount of volume.
• Simply, it’s the amount...
Density
• Examples:
a) Cold water/air b) Warm water/air
Let’s Practice
• Pick up worksheet and calculator.
• Answer questions.
How do we find the density of a
substance?
1. You need to know the MASS.
-simply use a scale or triple beam balance to
obt...
2. You need to
know its
VOLUME.
The OBJECTS
The OBJECTS
FORMULA?
L x W x H
Length = 6cm
FORMULA?
L x W x H
Length = 6cm
Height = 4cm
FORMULA?
L x W x H
Length = 6cm
Height = 4cm
Width = 2cm
FORMULA?
L x W x H
Length = 6cm
Height = 4cm
Width = 2cm
So, the VOLUME of this object is
48 cm3
The OBJECTS
Find VOLUME
The METHOD
-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
1. Note the water level
-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
2. Place the object in liquid
-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
3. Note difference in water level
The water level changed 15mL
We can say the rock displaced 15mL
-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
It gets better!
-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
Volume of our rock…
•Can’t use the volume formula (no edges)…
•Can’t use the displacement technique….
Steps…
First find the MASS:
Find the mass of the container = “a”
Fill container with water and obtain the mass of both =...
Density
• Today, you will be finding the DENSITY OF
several substances:
1. Water
2. A block of wood
3. A rock called grani...
THE EQUATION
D =M
V
THE TRICK
Cover up the one you want to solve for!
Let’s solve for VOLUME.
“M over D”
is remaining
so we divide!
Let’s solve for Density.
“M over V”
is remaining
so we divide!
Let’s solve for Mass.
“D next to V”
is remaining
so we
multiply!
Density solutions…
Water = 1 g/mL3
Wooden Block = .50 g/cm3
Granite = 2.7 g/cm3
Basalt = 3.0 g/cm3
5_Density Lab Overview
5_Density Lab Overview
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5_Density Lab Overview

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5_Density Lab Overview

  1. 1. DENSITY Mr. Bantay - Oceanography
  2. 2. LAB OVERVIEW: Density • The Earth is structured on the basis of DENSITY
  3. 3. What is Density? • Density is described as the amount of matter within a given amount of volume. • Simply, it’s the amount of molecules in a given amount of space. • As a result, substances with a higher density will settle to the bottom and substances with lower density will rise. • The size of the substance will NOT affect DENSITY.
  4. 4. Density • Examples: a) Cold water/air b) Warm water/air
  5. 5. Let’s Practice • Pick up worksheet and calculator. • Answer questions.
  6. 6. How do we find the density of a substance? 1. You need to know the MASS. -simply use a scale or triple beam balance to obtain its mass (in grams).
  7. 7. 2. You need to know its VOLUME.
  8. 8. The OBJECTS
  9. 9. The OBJECTS
  10. 10. FORMULA? L x W x H Length = 6cm
  11. 11. FORMULA? L x W x H Length = 6cm Height = 4cm
  12. 12. FORMULA? L x W x H Length = 6cm Height = 4cm Width = 2cm
  13. 13. FORMULA? L x W x H Length = 6cm Height = 4cm Width = 2cm
  14. 14. So, the VOLUME of this object is 48 cm3
  15. 15. The OBJECTS
  16. 16. Find VOLUME
  17. 17. The METHOD -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL
  18. 18. 1. Note the water level -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL
  19. 19. 2. Place the object in liquid -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL
  20. 20. -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL
  21. 21. -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL 3. Note difference in water level
  22. 22. The water level changed 15mL We can say the rock displaced 15mL -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL
  23. 23. It gets better! -40mL -35mL -30mL -25mL -20mL -15mL -10mL -5mL
  24. 24. Volume of our rock…
  25. 25. •Can’t use the volume formula (no edges)… •Can’t use the displacement technique….
  26. 26. Steps… First find the MASS: Find the mass of the container = “a” Fill container with water and obtain the mass of both = “b” Find mass of JUST WATER = “b” – “a” Now let’s find the VOLUME: Simply find the volume of the container. Use density formula: D = mass/volume
  27. 27. Density • Today, you will be finding the DENSITY OF several substances: 1. Water 2. A block of wood 3. A rock called granite (a rock that makes up the Earth’s continental crust) 4. A rock called basalt (a rock that makes up the Earth’s oceanic crust) 5. 5 minerals: pyrite, galena, quartz, fluorite, topaz
  28. 28. THE EQUATION D =M V
  29. 29. THE TRICK
  30. 30. Cover up the one you want to solve for!
  31. 31. Let’s solve for VOLUME. “M over D” is remaining so we divide!
  32. 32. Let’s solve for Density. “M over V” is remaining so we divide!
  33. 33. Let’s solve for Mass. “D next to V” is remaining so we multiply!
  34. 34. Density solutions… Water = 1 g/mL3 Wooden Block = .50 g/cm3 Granite = 2.7 g/cm3 Basalt = 3.0 g/cm3

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