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.
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.
Dozens of experiments you can do at home
Kids are now able to engage with science in a way that they simply wouldn’t have been able to in the past as they shrink themselves down to see the world at a molecular level