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Q & A: hot and cold water

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Most recent answer: 05/15/2018
Q:
What is the difference between a drop of cold water and a drop of hot water?
- Michelle (age 13)
Barrie, Ontario, Canada
A:

Great question. 

In either the hot or cold water the molecules are jiggling around. In the hot water the molecules are jiggling a little more. They're moving faster, sometimes smashing a little closer into each other, sometimes pulling a little farther apart. On average, the hot water molecules are just a little farther apart, less dense. The hot water flows a little more easily too.

Mike W.


(published on 05/15/2018)

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