# physical constant

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## physical constant

[′fiz·ə·kəl ′kän·stənt]
(physics)
A physical quantity which has a fixed and unchanging numerical value.
References in periodicals archive ?
Prague 70, 30-901 Krakow by specialist armed security (SUFO) in all day shifts, to the direct protection of physical constant dozorze signals transmitted, collected and processed in the systems of technical protection, escorting documents and property and possible intervention if necessary to protected areas.
No one knows why, but scientists say the kilogram's current definition--"a unit of mass equal to the mass of the international prototype of the kilogram"--no longer works; they're trying to develop one that's based on a physical constant rather than an object whose weight can change.
Let us initially simplify matters greatly by assuming that we have only one physical constant to explain--call it [lambda]--which we shall assume takes on an improbable value in our universe.
Physical constants used in the determination of the airkerma rate Physical constant Value Relative standard uncertainty (%) [[rho].
This idea is termed the anthropic principle, and it applies to any situation in which the value of a physical constant or other fundamental quantity, if changed even a few percent, would preclude life.
These include a nearby supernova or other massive explosion (such as the collapse of an invisible black hole), or the sudden breakdown of a seemingly stable physical constant.
0] is not a known physical constant, neither is the value of the spacetime bulk modulus [[bar.
It turns out that if the strength of any force or the value of any physical constant were even slightly different, the universe would probably have evolved into something entirely unlike what we see today--and would not have led to the exquisite carbon chemistry that is key to the emergence of human life.
As this is a physical constant (e), the amp will be directly measurable without reference to the attraction between two wires carrying a current in a watt balance.
Now, scientists hope to define the kilogram by referring to a physical constant rather than an antique object.
Physical constant and the Gurzadyan-Xue formula for the dark energy.
In the June 20 NATURE, Schlesinger and Tom Wigley at the University of East Anglia in Norwich, England, demonstrated analytically that the lag time between increased greenhouse-gas levels and warmer temperatures is not a fixed, physical constant, as many past CO.

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