Constant (disambiguation)
- Constant (disambiguation)
A constant is something that does not change, over time or otherwise: a fixed value. In most fields of discourse the term is an antonym of "variable", but in mathematical parlance a mathematical variable may sometimes also be called a constant. __TOC__More particularly, the term constant has several uses:
In physics and chemistry
* Physical constant, a physical quantity that is generally believed to be both universal in nature and constant in time, such as "c", the speed of light, or "h", the Planck constant
* Mathematical constant, a real number with unique mathematical properties
* Cosmological constant, usually denoted by Λ, a parameter modifying the original equations of the theory of general relativity, introduced by Einstein and important for determining the ultimate fate of the universe as predicted by the theory
* Time constant, usually denoted by τ, a value characterizing the frequency response of a first-order, linear time-invariant system
* Reaction rate constant, often denoted "k" or λ, a value characterizing the speed of a chemical reaction
For people
* Constant (given name), a given name
* Constant (surname), a surname
* Constans, a Roman Emperor who ruled from 337 to 350
Other
* USS "Constant"
* The Constant, an episode of Lost
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