5_density lab overview
TRANSCRIPT
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DENSITY
Mr. Bantay - Oceanography
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LAB OVERVIEW: Density
• The Earth is structured on the basis of DENSITY
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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.
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Density• Examples:
a) Cold water/air b) Warm water/air
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Let’s Practice
• Pick up worksheet and calculator.
• Answer questions.
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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).
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2. You need to know its VOLUME.
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FORMULA?
L x W x H
Length = 6cm
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FORMULA?
L x W x H
Length = 6cm
Height = 4cm
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FORMULA?
L x W x H
Length = 6cm
Height = 4cm
Width = 2cm
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FORMULA?
L x W x H
Length = 6cm
Height = 4cm
Width = 2cm
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So, the VOLUME of this object is
48 cm3
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The METHOD
-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
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1. Note the water level
-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
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2. Place the object in liquid
-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
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-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
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-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
3. Note difference in water level
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The water level changed 15mL
We can say the rock displaced 15mL
-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
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It gets better!
-40mL
-35mL
-30mL
-25mL
-20mL
-15mL
-10mL
-5mL
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Volume of our rock…
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•Can’t use the volume formula (no edges)…•Can’t use the displacement technique….
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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
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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
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THE EQUATION
D =M
V
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THE TRICK
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Cover up the one you want to solve for!
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Let’s solve for VOLUME.
“M over D”
is remaining
so we divide!
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Let’s solve for Density.
“M over V”
is remaining
so we divide!
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Let’s solve for Mass.
“D next to V”
is remaining
so we
multiply!
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Density solutions…Water = 1 g/mL3
Wooden Block = .50 g/cm3
Granite = 2.7 g/cm3
Basalt = 3.0 g/cm3