Dear Netta --
Powdered milk should work a little better than whole milk because the
particle size is generally a little smaller. The more fat in the milk, the
larger the particle size, and the less effective the scattering. But I just
tried it myself again with one percent milk, and it worked just fine. An
advantage of powdered milk is that it can be kept a long time without
spoiling, so it can be easily kept on hand in a school science supply room.
But since regular milk is so readily available, that may not be very
important.
Hope this helps.
Don Rathjen
Exploratorium Teacher Institute
donr@exploratorium.edu
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