Magdeburg's hemispheres(cast iron) evacuated, can't be separated.

Magdeburg's hemispheres (cast iron) evacuated, can't be separated. When air is allowed into the cavity,the hemispheres can be separated easily. When cavity is evacuated with vacuum pump, hemispheres cannot be separated... FLUID STATICS.
UCB Index: 
C+30+5
PIRA Index: 
2B30.30
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Careful of professors handling interior of spheres and getting grease on their hands. Include material to allow them to clean up.