Is the buoyant force greater than,
less than, or equal to, the weight of
the objects below?
Fig. 1
Fig. 2
Fig. 3Less Than
...
ReviewReview
 Density
 Buoyancy

Liquids

Gases
Density AnomalyDensity Anomaly
 Hydrogen bond - when
the (+) side of an H2O
molecule attracts the (-)
side of another H2O...
Liquid HLiquid H22OO Hydrogen
bond
Density AnomalyDensity Anomaly
 As H2O cools off, the
hydrogen bonds become
stronger
 “ice” crystals form
Regular
repeat...
Solid
H2O
“ice”
Water Ice
Density AnomalyDensity Anomaly
 As ice forms, its volume
increases
 But its mass stays the
same
Density AnomalyDensity Anomaly
 When the volume goes up,
but the mass stays the
same, the density goes
down
Why does ice float?Why does ice float?
 Solid H2O (ice) is less
dense than liquid H2O
(water)
 Ice = .9 g/cm3
 Water = ...
Lake Superior
froze over
completely in 1996
Density Anomaly
Density Anomaly
Density Anomaly
Density Anomaly
Density Anomaly
Density Anomaly
Density Anomaly
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Density Anomaly

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Density Anomaly

  1. 1. Is the buoyant force greater than, less than, or equal to, the weight of the objects below? Fig. 1 Fig. 2 Fig. 3Less Than Greater Than Equal To
  2. 2. ReviewReview  Density  Buoyancy  Liquids  Gases
  3. 3. Density AnomalyDensity Anomaly  Hydrogen bond - when the (+) side of an H2O molecule attracts the (-) side of another H2O molecule
  4. 4. Liquid HLiquid H22OO Hydrogen bond
  5. 5. Density AnomalyDensity Anomaly  As H2O cools off, the hydrogen bonds become stronger  “ice” crystals form Regular repeating arrangement of atoms
  6. 6. Solid H2O “ice”
  7. 7. Water Ice
  8. 8. Density AnomalyDensity Anomaly  As ice forms, its volume increases  But its mass stays the same
  9. 9. Density AnomalyDensity Anomaly  When the volume goes up, but the mass stays the same, the density goes down
  10. 10. Why does ice float?Why does ice float?  Solid H2O (ice) is less dense than liquid H2O (water)  Ice = .9 g/cm3  Water = 1 g/cm3
  11. 11. Lake Superior froze over completely in 1996
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