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Old 04-23-2006, 02:52 AM
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That is a some-what vague topic....

When water is heated, it's molecules gain energy and move about rapidly. Thus, they create more inter-molecular space and thus, a solid will dissolve quicker...

Some substances like kerosene and oil do not dissolve in water but float on it as their density is lower than that of water..

Some substances like coal sink without dissolving as their density is higher than that of water...

Also, the molecules of these substances do not mingle with those of water.
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