Physical Menu |
|
|
Material:Soda CanHot Plate Water A Bowl Goggles Tongs |
Future Quicktime Movie and photos of the demo to go here! |
Procedure:Turn on the hot plate. CAUTION: you are using a device that is capable of producing a high amount of heat. Make sure you use appropriate safety equipment when heating substances. Place a small amount of water (less than one teaspoon) in an empty soda can. Prepare the bowl by filling it æ full of cool water. Place the soda can on the hot plate and allow the water in the soda can to boil almost completely away. Grasp the HOT soda can with your tongs and invert it quickly into the cool water bath. |
|
Questions:Predict what happens to the soda can when you invert it into the cool water bath.Why does the soda can implode? What role does air pressure play in this process? How does this relate to ìeverydayî problems you might face?
Rationale:By placing a small amount of water in the soda can and boiling it, you are causing the molecules of air inside the can to heat up and be ìforcedî out of the can. However, the pressure inside and outside the can remain constant or in equilibrium. So, the remaining air molecules in the can must be moving more quickly. By inverting the soda can in the water bath you are quickly reducing the temperature of the can and the air inside the can. When we cool the air, the molecules move slower and hence they exert less pressure on the inside of the can. Since there is now greater pressure outside of the can the can implodes.
Application:Air Pressure
|
Physical Menu |
|
|
