Boil small amount of water in can. Hot water vapor fills can.
Invert can in cool water. Close up of crushed can. Water vapor condenses. Pressure drops and atmospheric pressure crushes can.
To see a (RealVideo, ".rm") video of this demo click here.>
To see a (low-bandwidth--.mpg) video of this demo click here.>
click here for a
more detailed explanation of coke can crushing demo.
In a similar way one can also use air pressure to crush a 55 gal. oil drum.
To see a (high-bandwidth-.mpg) video of this demo click here.>
To see a (low-bandwidth-.mpg) video of this demo click here.>