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About Dan Fink
Expertise
Though my experience is mostly in the fields of electricity, magnetism, and physics, I have a broad science background. My career is in the field of alternative power sources -- solar, wind, water and battery power. But any questions about electricity, magnetism, energy conservation, power generation, electric motors, and even general physics are very welcome--especially from kids. They ask the best questions of all! I pride myself in answering science questions accurately, with ideas for SAFE, easy experiments that kids can perform by themselves--and that let them prove the answers to their own satisfaction. I think science should be fun, and available to everyone, regardless of age.
Experience
I have volunteered in our local public schools for 5 years. I currently make presentations at our schools about electricity and magnetism, with a focus on solar, wind, water and other alternative power sources. I try to demonstrate at our schools how easy it is to make electricity, with simple devices using spinning magnets and coils of wire--powered by wind, water, bicycles, gerbils...etc. And of course solar panels! I am the webmaster of Otherpower.com, an alternative energy website. I have lived 10 miles from the nearest power pole for 11 years--I make all my own electricity from scratch with sun, wind and water.
Publications
Otherpower.com
Wondermagnet.com
Co author of the book "Homebrew Wind Power" ISBN 978-0-9819201-0-8
My articles appear regularly in such magazines as Home Power and Back Home
Education/Credentials
BA Technical Journalism
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You are here: Experts > Science > Science/Nature for Kids > Science for Kids > Separating Salt from Water
Expert: Dan Fink - 11/4/2009
Question
Hi-I have a project on separating salt from water. I was thinking of doing a still but I'm not finding any models that i can bring to class. It needs to work and i need to see water at the end free of salt. There is a hot plate i can use at school if needed. Thanks in advance!
Answer
Hi Jacquie --
Well, all a still really is, is evaporating off some stuff while leaving other stuff behind. So if you just leave salt water in a open container for long enough, the water will eventually evaporate off and leave the salt crystals behind. You can speed this up with heat and boiling -- the hot plate would probably work fine. Just remember that you can damage or crack whatever pot you use from the heat, after the water level gets too low to cool your vessel. And burned-on salt crystals may be hard to remove later.
DAN
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