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Author Topic: What causes the density of water to change in the way that it does?  (Read 1721 times)

Offline erickejah

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Why does the density of water is graph as a parabola function. And why is the peak at 4C?
« Last Edit: 26/06/2009 23:30:05 by chris »


 

Offline lightarrow

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Why does the density of water is graph as a parabola function. And why is the peak at 4C?
Don't know if it could be reasonably approximated with a parabola (near the vertex, every function with a minimum and which graph is bent can be appr. with a parabola) but the general behaviour can be understood: for T slightly > 0, density increases because water molecule are more packed in the liquid; at the same time, increasing T, molecular agitation increases and so intermolecular distances so there will be a value of T were the increased packagin goes to an end, and the increased agitation begins to win; at this point density starts decreasing.
 

Offline erickejah

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are any other elements or substances with this behavior?
 

Offline lightarrow

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are any other elements or substances with this behavior?
Ga, Sn, Si, Ge, Bi
 

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