a quick experiment in the buoyancy of liquids

will other liquids float in water?
is oil lighter than water? is rubbing alcohol?
make your hypothesis and then see what happens.

first, we poured water with blue food coloring into the glass.
next, we poured in cooking oil slowly down the side
so that it would not mix.
finally, we poured rubbing alcohol with red food coloring down the side of the glass,
again slowly so they stay separate.

what’s happening?
the cooking oil and the rubbing alcohol
both have a lesser density than water
so they float in water.
however, if the cooking oil were not in between,
the alcohol and water would easily mix.

sometimes a quick experiment after breakfast or lunch
makes a easier segue into more in-depth work.


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