Buoyancy of Air

2B40.40A | Af3
Catalog: 
2B40.40A
Location: 
Af3
Room: 
PS F175
Quantity: 
1
Setup Time: 
1 Hour
Instructors: 
Corkins
  • A weight and a sphere are balanced. A small dab of clay was added to achieve thi
    A weight and a sphere are balanced. A small dab of clay was added to achieve this.
  • Close the air valve and turn on the vacuum pump. The small ballon is to verify t
    Close the air valve and turn on the vacuum pump. The small ballon is to verify that the air pressure is changing.
  • As the density of air decreases so does the buoyancy on the larger volume sphere
    As the density of air decreases so does the buoyancy on the larger volume sphere.
  • The sphere is clearly heavier in a vacuum that the counter balance weight.
    The sphere is clearly heavier in a vacuum that the counter balance weight.
Description: 

Balanced sealed globe tips the scales towards it under bell jar during evacuation.

Parts: 

bell jar (Dm2), pump (Dn4)