Feb 242010
One of the questions on my Chem. homework asked me to explain why a metal collaspes when air is pumped out of it with a vacuum tube in terms of a kinetic-molecular model.
Help is greatly appreciated.
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your question isnt too clear to me but i know that such a phenomenom occurs because the atmospheric air pressure is greater than the pressure in the can u can use kinetic thoery to explain this ie by virtue of the movement of molecules of the can acted upon by the air molecules
you should look in some encyclopedia.
the air pressure inside is lower than the air pressure outside the can. the higher air pressure outside crushes the can.
next
well I don’t know about a kinetic molecular model, but I can give you the short and sweet of why this happens. 1 atmosphere (or 1 bar), is the amount of pressure that air exerts on everything at mean sea level and is equal to roughly 14 PSI. So the can has an equal density (or pressure) of air inside it as outside it. When you start pumping air out of it, it lowers the density of air inside the can, thus lowering the pressure. So there is much more pressure outside the can as inside. If the can is weak enough, it will collapse because of the pressure pushing in on it.
the reason for the metal to collapse is because whe using the vacuum pump the molecules of gas are being pumped out. this is not replace because of the seal. when the pressure is to inwards (pulling) pressure is to great for the can or metal it collapses, and fills the space in the middle of it. much like a brittle space bag.