Vacuum chamber

Feel the power of the atmosphere!

25 minutes


  • Carefully review the general safety advice on the back of the box cover before starting the experiment.
  • Disassemble the setup after the experiment.


  • Dispose of solid waste together with household garbage.

Scientific description

The air  around us presses  on all of the objects it encounters. If air  is able to freely move  between surfaces, this pressure  is equal on all sides.At the beginning of the experiment, the air pressure  inside the inverted glass  or hood is equal to the air pressure  outside. Therefore, the glass  is easy to lift or move.

To understand how much the outside air  compresses  the glass , let's reduce the amount of air  inside it. When you pull the syringe plunger, air is channeled  from under the glass  to fill the empty space. The tubes are connected to the syringe pump by special valves  that allow air  to move through the tubes toward the syringe, but not in the opposite direction. Therefore, when the syringe plunger is depressed, air  is forced out  of it through another valve .

The air pressure  inside the glass  depends on the amount of air in it. By pumping the air  out with the syringe, you create a vacuum—an area with pressure  lower than atmospheric pressure—inside the hood.

When the pressure  inside is much lower than outside, the outside air  compresses the hood  and its stand equally strongly from all sides, holding them together.