Magdeburg hemisphere

Magdeburg hemisphere

noun Physics.
one of a pair of hemispherical cups from which air can be evacuated when they are placed together: used to demonstrate the force of air pressure.

Origin:
after Magdeburg, where German statesman and physicist Otto von Guericke (1602–86) constructed a pair of such hemispheres
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Magdeburg hemisphere is always a great word to know.
So is excited state. Does it mean:
any of the energy levels of a physical system, such as an atom or molecule, that has higher energy than the lowest energy level
any two masses attract each other with a force equal to a constant, multiplied by the product of the two masses, divided by the square of the distance between them
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