Demonstrations
Pressure
   

P07: Magdeburg Hemispheres

 

Purpose: To show the large force that is exerted by the atmosphere on two disks.

Description:

 

Two plastic, 10cm-diameter hemispheres, each with a sturdy handle, make up this device. One hemisphere has a gasket seal; the other has a stopcock for attaching to a 0.8-1.2cm inner-diameter vacuum tubing. Join the hemispheres, hook them up to a vacuum pump, and evacuate them. Students will find it hard, if not impossible, to pull them apart. Open the stopcock to let air in, and the hemispheres separate easily.

 

Equipment List: Storage Location: Robeson206  

 

Magdeburg hemipsheres    
  Vacuum pump    
         

References:

Manual: None     PIRA #: 2B30.30  
 
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