While putting together a "Density bottle"
for a demonstration for a 6th grade class, I used
colored water and glycerin. The glycerin ended up
on the bottom for only a short time. As soon as
the bottle was shook the glycerin became
suspended in the water. Not what I wanted! After
a week it still has not separated. Could anyone
suggest a better liquid to use other than
glycerin? I need to get a liquid with a density
greater than 1.0 g/cm3. I use baby oil for
less than 1.0 --it is the bottom I am having
Try cooking oil and water. These separate real easily in the
kitchen. It also helps to cool the mixture so that the "fat"
Jack L. Uretsky
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Update: June 2012