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Collapsing Can

Collapsing Can. In this demonstration water in a can is heated to its boiling point When the can is inverted in ice water, it collapses. Purpose. To create a partial vacuum inside an object To observe the effect of atmospheric pressure on an object. Demonstration.

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Collapsing Can

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  1. Collapsing Can In this demonstration water in a can is heated to its boiling point When the can is inverted in ice water, it collapses

  2. Purpose • To create a partial vacuum inside an object • To observe the effect of atmospheric pressure on an object

  3. Demonstration • The can collapsed when the pressure outside it was greater than the pressure inside • The pressure inside could be reduced using a vacuum pump • or more simply • The pressure inside was reduced by cooling the gas inside

  4. Concepts 1. Atmospheric Pressure 2. Changes of State 3. Gases

  5. 1. Atmospheric Pressure • Air molecules constantly bombard all objects • The more frequently they hit an object, the greater the pressure they exert on an object • An object such as an open container experiences the same atmospheric pressure both inside and out

  6. 2. Changes of State • A liquid such as water may be converted to a gas by heating it • This conversion is a physical change of state • The molecules of the gas will occupy more space than they did in the liquid • Water molecules in the liquid state are in close contact • Water molecules in the gaseous state are separated from each other

  7. 3. Gases • Upon cooling a gas may be converted its liquid state • Upon cooling, steam condenses to liquid water • Liquid water occupies less space than steam

  8. Conclusions • When the pressure outside an object is greater than the pressure inside, a change will occur • The change is reversible • that is, • If the can could be sealed and reheated, it would regain its shape when the two pressures become equal again

  9. Can With Equal Pressures Both Inside And Outside

  10. When Pressure OUTSIDE is Greater Than Pressure INSIDE, CAN COLLAPSES!!!

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