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Re: [Phys-l] [tap-l] density

Instead of foam, how about plaster; not messy and cleans up w/ water. Dense, so use rather fewer washers.

bc taught by a santa Barbara Nat. History museum worker how to accelerate and retard setting time. [ca. 1970]

On 2008, Oct 06, , at 10:42, Anthony Lapinski wrote:

I want to do a density activity by filling empty soda cans with washers to
make them less buoyant. Is there a low mass "foam" available (Home Depot?)
that can be sprayed into the cams to seal the weights on the bottom so
that no water can get inside?