observable
American-
A measurable property of a physical system, such as mass or momentum. In quantum mechanics, observables correspond to mathematical operators used in the calculation of measurable quantities. Operators that do not commute, having a nonzero commutator, correspond to observables that cannot be precisely measured at the same time, such as momentum and position.
-
See also uncertainty principle
Other Word Forms
- nonobservable adjective
- nonobservably adverb
- observability noun
- observableness noun
- observably adverb
- unobservable adjective
Etymology
Origin of observable
1600–10; < Latin observābilis remarkable, equivalent to observā ( re ) to observe + -bilis -ble
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“Dreamworld” opens, in the section “Waking Dream,” with harbingers of Surrealism—fusing classicism and modernism, reality and fantasy—by Giorgio de Chirico, whom Apollinaire described as a painter of things beyond the observable.
Their research proposes that the universe includes additional dimensions that are not directly observable.
From Science Daily
Their results, reported in Nature Astronomy, offer important insights into atmospheric escape, a process that plays a central role in how planets evolve and develop their observable features.
From Science Daily
Simple calculations show that the entire observable universe, from individual atoms to galaxy clusters, exists because, in the early universe, only one extra matter particle survived for every billion matter-antimatter pairs.
From Science Daily
With this approach, the new technology is expected to expand the observable gravitational-wave universe by a factor of 10.
From Science Daily
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
