Blue Sky

Date: Wed Feb 21 2001 - 12:58:32 PST

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

Hope this helps.

Don Rathjen
Exploratorium Teacher Institute

This archive was generated by hypermail 2.1.3 : Mon Apr 24 2006 - 11:34:48 PDT