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Q & A: Distilled water

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Most recent answer: 10/22/2007
Q:
What is distilled water?
- Samantha (age 9)
Mississauga,Ontario,Canada
A:
Distilled water is water that has been boiled and then recondensed (that is, the water vapor is turned back into liquid water on a cold surface).

People distill water in order to purify it. Dissolved contaminants like salts are left behind in the boiling pot as the water vapor rises away. It might not work if the contaminants also boil and recondense, such as having some dissolved alcohol. Plus, you have to be careful not to re-contaminate the water after distilling it.

Tom

(published on 10/22/2007)

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