Einstein elevator

Einstein elevator

[′īn‚stīn ′el·ə‚vād·ər]
(relativity)
A windowless elevator freely falling in its shaft, inside of which conditions resemble interstellar space; used to elucidate the principle of equivalence.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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