speed of light

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Noun1.speed of light - the speed at which light travels in a vacuumspeed of light - the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second
constant - a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant"
speed, velocity - distance travelled per unit time
References in periodicals archive ?
In the pharma world, the focus is primarily on moisture barrier, but other key factors include gas barrier, chemical resistance, and ultraviolet light barrier.
Metalized films create an effective light barrier, which keeps UV and visible light from attacking the oils within the product itself, causing them to turn rancid at an accelerated rate.
The versatility is also shown by the availability of the U500 in three sensor principles: As a proximity switch, distance measuring sensor and reflective light barrier.
The barrier could be EVOH or nylon sandwiched between inner and outer layers of PET; or, in the case of milk bottles, a black HDPE layer could provide light barrier between two white HDPE layers.
A light barrier linked to the system automatically adjusts stroke length and gun positions to maintain optimum transfer efficiency.
The absurdity of acausality leads one to the conclusion about the existence of the isotropic light barrier, i.
The Pharma Blender is a stationary blending device, consisting of PM machine body with load suspension device, an electrical switch cabinet integrated in machine body (separate installation optional upon request), separate operator panel, and safety light barrier or laser scanner (optional).
The first light barrier was positioned closer to the participant's wrist, the second 20 cm further away.
It also can be used to improve material light barrier properties in specific wavelength regions.
India, June 21 -- Baumer has unveiled a new sensitive version of its SmartReflect Light Barrier, the first photoelectric light barrier to operate without a separate reflector or receiver.
Nick Copeland, general product manager at General Vacuum, said: "The amount of metal deposited on the surface of a film will govern the oxygen, water vapour transmission and light barrier properties of that film.
Using a single light barrier that is suitable for all product lengths, the new askew package detection feature does away with the need for mechanical adjustment of photocells, reducing changeover time.