Quick Answer: The Vacuum and Atmospheric Pressure apparatus is a set for showing the force of air pressure and the effects of a vacuum. It has a polycarbonate bell jar 250 mm high and 200 mm in diameter, brass Magdeburg hemispheres and a dial gauge reading 0 to -760 mmHg.
Last updated: October 2026
Key Features
Thick-walled polycarbonate bell jar, 250 mm high and 200 mm in diameter
Base plate in non-magnetic alloy with silicone sealing gaskets
Cast brass Magdeburg hemispheres with release stopcocks and pull rings
Analog dial gauge in two units: 0 to -760 mmHg and 0 to -100 kPa
Dual-stage manual suction cylinder for evacuating the jar
Barometric pressure column and silicone O-ring seals
Technical Specifications
Specification
Value
Bell jar
Polycarbonate, 250 mm height, 200 mm diameter
Base plate
Non-magnetic alloy, silicone gaskets
Magdeburg hemispheres
Cast brass, stopcocks, pull rings
Gauge
0 to -760 mmHg / 0 to -100 kPa
Pump
Dual-stage manual suction cylinder
About This Product
With the hemispheres evacuated, students find how hard it is to pull them apart and use that to discuss the load air exerts at sea level. Inside the bell jar the class can watch a sound fade as air is removed, see sealed flexible items swell, and link boiling to the pressure around a liquid, while the column and gauge give readings to compare.
Frequently Asked Questions
What does the gauge on the apparatus read?
A two-unit analog dial gauge shows 0 to -760 mmHg and 0 to -100 kPa.
How is the air removed?
A dual-stage manual suction cylinder evacuates the bell jar and the Magdeburg hemispheres.
