On Sep 22, 11:12 am, "Roger Long" wrote:
There's another neat way you can demonstrate this with minimal equipment.
Take a tight fitting jar and get the water boiling vigerously in it with the
cap on loose enough to let the steam out. When it is full of dense steam
and about 1/3 boiling water, remove instantly from heat and tighten cap.
When everything is cooled to room temperature, put an ice cube against the
jar and the water will start to boil. The ice condenses the water vapor
further, reducing the pressure to the point where the water will boil at
room temperature.
I've seen it done and it looks like the ice cube is boiling the water.
My father won a science fair doing this back in the 1930's.
--
Roger Long
http://www.metacafe.com/watch/414997/boiling_using_ice/
Joe