Sink or Float Lab

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Sink or Float Lab
Density how to figure it all out!
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Relationships

• Mass is Higher
• Volume is Lower
• Mass is Lower
• Volume is Higher

SINKS
FLOATS
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Why does a log float while a pebble sinks?
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Definition of Density

• A ratio that compares an objects mass to its
  volume

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We can calculate density using the formula

• Density Mass ? Volume

Density Mass Volume
Units g/ml or g/cm³
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Density of Water

• 1g/cm3
• IF the density of object is greater than 1 g/ cm3
  it will SINK!
• Density gt 1g/ml SINK
• IF the density of the object is less than 1 g/
  cm3 it will FLOAT!
• Density lt 1g/ml FLOAT

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• Take a look at the two boxes below.
• Each box has the same volume.
• If each ball has the same volume, which box would
  have more MASS? Why?

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The box that has more balls has more mass per
unit of volume. Since mass is usually expressed
in grams and volume in cubic centimeters, density
is expressed in grams/cubic centimeter.
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Block I Mass 79 grams Volume 29 cubic cm.
79 grams
Density
29 cm3
Density 2.72 g/cm3
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Block 2Mass 25 grams Volume 29 cubic cm.
25 grams
Density
29 cm3
Density 0.86 g/cm3
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What is each block made of?
Using the table, on the next slide, it is now
possible for you to determine what substance
makes up each block.
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Density Chart
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Block 1?
Aluminum
Block 2 ?
Wood
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Cylinder Densities
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All pictures and text were adopted from the
following websitehttp//www.edinformatics.com/ma
th_science/mass_volume_density.htm