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Balloon-vacuum (Kenneth D. Howard)

Title

Balloon Vacuum

          

                                                                         

Author(s)

by Kenneth D. Howard


Principles Illustrated

            Kinetic energy  of molecules
            Enthalpy/ Energy Transfer
            Equilibrium of a system
            Air pressure 
            The relationship between heat and the volume of gases
            Vaporization of water and Condensation of water vapor



Standards

            

            Energy is the property of many substances and is associated with heat
            
            Heat moves in predictable ways, flowing from warmer objects to cooler ones until both reach the same 
            temperature.
        
            Unbalanced forces will cause change in the direction of an object's motion

         


Questioning Script

Prior knowledge & experience:

            All student are familiar with the properties of a balloon and how to blow it up.


Root question: 

            When I attach the balloon to the flask what will happen?

            What is occurring when the balloon is drawn into the flask?

            What is happening to the water vapor as the flask cools?

            How much air is in the sealed flask?

            What role does air on the outside play?


Target response:

            Students will suggest the balloon will inflate.

            Upon seeing the balloon going inside the students will respond that something is pulling 

            it inside the flask.


Common Misconceptions:

            Most students will think the balloon will inflate since the flask was heated up, 

            they will think the hot air molecules will make the balloon expand.

            The air in the flask is pulling the balloon down inside.


Photographs and Movies


PicasaWeb Slideshow











                    



References

                       http://www.mcrel.org/whelmers/index.asp



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