Drainage - a kitchen experiment

Judy Glattstein jglatt@hughes.net
Fri, 23 Feb 2007 14:16:11 PST
Concerning drainage - A very simple visual lesson I offer students is to 
take a new synthetic sponge (flat, rectangular, color choice optional) 
and saturate it with water. Put it on a rack over a tray, long dimension 
horizontal, while I continue to talk. When the sponge stops dripping, 
stand it up on end (a la the 2001 monolith.) Never fails to astonish 
students how much additional water drips out the second time around. Can 
then squeeze the sponge to remove even more water. Add more precision to 
the exercise by A) measuring water needed to saturate sponge, B) measure 
how much drips from horizontal sponge, how much drips from vertical 
sponge, how much can be squeezed out.

Judy in very windy New Jersey

More information about the pbs mailing list