**Quantum Mechanics**

In quantum mechanics, a measurement is an action that determines the location of an object, its momentum, its polarity (if it is a photon), etc. Before a measurement is made, the wavefunction of what is to be measured gives the range of probabilities for the outcomes of measurement, but when a measurement is accomplished that results in what is called the *collapse of the wavefunction*− at which time there is one definite value rather than a range of possible values. The unambiguous meaning of the measurement problem is an unresolved fundamental problem in quantum mechanics.

Read more about this topic: Measurement, Definitions and Theories

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And the kitchen table exists because I scrub it.”

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“A personality is an indefinite *quantum* of traits which is subject to constant flux, change, and growth from the birth of the individual in the world to his death. A character, on the other hand, is a fixed and definite *quantum* of traits which, though it may be interpreted with slight differences from age to age and actor to actor, is nevertheless in its essentials forever fixed.”

—Hubert C. Heffner (1901–1985)