Vacuum teaching device

Details Vacuum teaching device Vacuum teaching device

1996-05-06

1998-02-24

Hafer, Robert A.

Education and demonstration

Science

Physics

434283, G09B 2306

Patent

active

057206180

ABSTRACT:
The present invention relates to a vacuum teaching device (10) comprising: a housing (12) which comprises a housing top (12A) having a housing top opening (12AA) therein, a housing bottom (12B) and a housing middle (12C) having a housing middle neck piece (12CA) pneumatically sealed thereon. The housing middle neck piece (12CA) has a housing middle neck piece opening (12CAA) therein. A housing top cap (12D) is removably and pneumatically fastenable to the housing top (12A). A balloon (14) is positioned within a housing inside (12E) of the housing (12). The balloon (14) comprises a balloon opening (14A) which is stretched overlapping the housing middle neck piece (12CA) and housing middle neck piece opening (12CAA) forming a pneumatic seal therebetween. When air pressure is reduced within the housing inside (12E) by vacuuming air through the housing top opening (12AA), the balloon (14) automatically inflates.

REFERENCES:
patent: 3343701 (1967-09-01), Mahoney
Balloon In A Vacuum, Internet:http://www.physics.unc.edu/.about.labs/demo/thermo/4e20.40html, UNC Physics & Astronomy.

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