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We are going to make various copper wire forms such as those shown in the following drawing.
Last week we made a mystery liquid by putting four level teaspoons of soap powder into four cops of hot water. (If there isn't any soap powder, one teaspoon liquid detergent will do.) There really isn't any mystery about a soap solution, but it is a mystery until we know what we're going to do with it.
the forms into the solution and then carefully take them out of the liquid.
Take a look at that! Looks like that bubble stuff, doesn't it? It probably
is very close to
Instead of just admiring the pretty bubbles we would get by gently blowing through the film of liquid stretched across the wire form, we will try to figure out how it got there, and why it stayed.
To call this
liquid on the wire a "film" really doesn't tell us what it is.
Mr. Webster didn't help an awful lot this time, when I looked up "film,"
because he said "a thin
So a film of soap solution has formed on the wire we put into the solution. Let's dip the wire in again, and see if the film gets thicker, or if another film forms on it.
of course, are of different shapes, so we know that the liquid will adapt
to many shapes. We already learned that liquid has no shape of its own,
It's almost like elastic, isn't it?
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