Magdeburg Hemispheres Rubber Manufacturer,Supplier and Exporter
Product Code : SEL-PLE-10164
Quick Answer: No pump is needed with these rubber Magdeburg hemispheres: students press the two 7.5 cm cups together to squeeze out the air, then find in a tug of war that air pressure makes them hard to separate.
Last updated: October 2026
Key Features
Two rubber hemisphere cups, 7.5 cm diameter
Shows the force of air pressure without a vacuum pump
Air is forced out by pressing the cup edges together
Each hemisphere has 2 finger-tug handles
Each hemisphere has 2 release posts
Technical Specifications
Specification
Value
Material
Rubber
Diameter
7.5 cm
Handles
2 per hemisphere
Release posts
2 per hemisphere
Vacuum pump
Not required
About This Product
This is a modern, hands-on variant of the historic Magdeburg experiment. Pupils place the rims of the two cups together and squeeze, pushing out the air between them; the outside air then holds the cups shut. Pulling them apart by the finger handles turns into a surprisingly hard tug of war, and the release posts let the seal be broken so the cups can be reused straight away.
Frequently Asked Questions
Do the rubber Magdeburg hemispheres need a vacuum pump?
No. Students squeeze the two cups together to force out the air between them, so the demonstration works without any pump.
How are the cups separated after the demonstration?
Each 7.5 cm hemisphere has 2 release posts for breaking the seal, as well as 2 handles for the tug of war.
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