Date: Thu Dec 4 21:58:38 2008

Author: William Gregg

Subject: Re: What is your favorite density demo/activity?


With this demo I like to remind students that is why we drink diet
soda--because "it's lighter" and floats. When they wonder why, I
tell them that all that sugar weighs something.
I also like to show density in solids, sort of. In a large beaker of
small plastic beads, I hide a ping pong ball. Place an orange golf
ball on the beads and predict that I'll change the orange ball to a
white one. Shake the beaker with hand over opening and the ping pong
ball "floats" to the top and the golf ball "sinks" to the bottom.

William Gregg
Physics Instructor
Department of Physics & Astronomy
279 Nicholson Hall
Louisiana State University
Baton Rouge, LA 70803
office: 578-4779
cell #:225-281-6027

On Dec 3, 2008, at 6:39 AM, Anthony Lapinski wrote:

> I like the diet/regular soda can demo in a small aquarium. Simple
> setup,
> and kids can try it at home. Parents are fascinated with this on
> Back To
> School Night!
> writes:
>> Personally, I like to float a bowling ball, then put ice in water
>> then in
>> alcohol, and finally for the big finale, I like to put colored ice in
>> some corn syrup, if you use red food coloring when you make the
>> ice, it
>> looks like the ice is bleeding!
>> What do you guys like to use, or have your students do?