What does the Guided Investigation look
The groups begin by measuring out and beating their foam based
on the recipe in the instructions.
Bowl A is beaten 200 strokes...
Bowl B is beaten 600 strokes...
A tower from the 200 stroke batch...
and a tower from the 600 stroke batch...
After looking at the two foams to observe any differences, each
pair attempts to build the highest tower they can from
the two batches:
When placed side by side, it's apparent that the less-beaten
foam, which has lighter, larger bubbles, build a higher tower
Next, each pair builds a tower of foam four inches high from
each batch to see what is the longest sharpened dowel that
will stand up in in each.
The 200-stroke batch:
the 5" dowel stands up
but the 7" dowel falls over
The 600-stroke batch:
the 12" dowel falls over
but the 9" dowel stands up
Both batches placed side by side. It looks like the 600-stroke
foam has smaller, denser bubbles that hold up objects better
than the 200-stroke foam, which has larger, fluffier bubbles.