Density Anomaly
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Transcript of Density Anomaly
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
ReviewReview Density Buoyancy
Liquids Gases
Density AnomalyDensity Anomaly Hydrogen bond - when the (+) side of an H2O molecule attracts the (-) side of another H2O molecule
Liquid HLiquid H22OO Hydrogen bond
Density AnomalyDensity Anomaly As H2O cools off, the
hydrogen bonds become stronger
“ice” crystals formRegular
repeating arrangement
of atoms
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 = 1 g/cm3
Lake Superior froze over
completely in 1996