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Why does the black tar placed in between sidewalk cracks ooze out on hot days? 

          Why does the black tar placed in between sidewalk cracks ooze out on hot days?

Added by Drew G.

University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
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Why does the black tar placed in between sidewalk cracks ooze out on hot days?
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Transcript

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00:01 There are a couple of reasons why spreading salt on an icy sidewalk causes the ice to melt.
00:06 First is we recognize that the presence of the solute in a solvent, the solute being the salt, the solvent being water, lowers the freezing point.
00:17 Therefore, the liquid state can exist at lower temperatures.
00:22 So if we have ice on a sidewalk and we add some salt, the ice is, the ice still exists equilibrium with water.
00:33 So there's still a small amount of water present...
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