Egg Crusher


To show that an egg can support unexpectedly high forces due to its curved shape.


Egg crusher, eggs, and six lead bricks, as photographed.


A foam rubber "lead brick" will be furnished on request. Scare the dickens out of your students by throwing the foam rubber brick into the group during the demonstration.◙

Setup Time

5 min. (1 day to furnish the egg.)




An egg is positioned vertically between the "egg crusher" base and top cylinder. The two surfaces are ◙coated with heavy rubber discs to distribute the load. Up to 150 lbs of lead bricks (6 bricks) can be placed on the platform without breaking the egg. A dramatic finish to the exxperiment (other than the egg unexpectedly rupturing) is to unload the bricks and drop the egg about 6" onto a hard surface, which will smash the egg. ◙


(PIRA unavailable.)