- equilibrium constant (chemistry) the ratio of concentrations when equilibrium is reached in a reversible reaction (when the rate of the forward reaction equals the rate of the reverse reaction)
- equilibrium a stable situation in which forces cancel one another
- solar constant the rate at which radiant solar energy is received at the outer layer of the earth's atmosphere
- rydberg constant a wave number characteristic of the wave spectrum of each element
- color constancy the tendency for a color to look the same under widely different viewing conditions
- colour constancy the tendency for a color to look the same under widely different viewing conditions
- Hubble's constant (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today
- Hubble constant (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today
- equilibrium law (chemistry) the principle that (at chemical equilibrium) in a reversible reaction the ratio of the rate of the forward reaction to the rate of the reverse reaction is a constant for that reaction
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- Planck's constant the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
- inconstant likely to change frequently often without apparent or cogent reason; variable
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- time constant (electronics) the time required for the current or voltage in a circuit to rise or fall exponentially through approximately 63 per cent of its amplitude
- constant uninterrupted in time and indefinitely long continuing
- equidistant exactly as far from one point as from another
- cosmological constant an arbitrary constant in the equations of general relativity theory
- equilibration stabilization by bringing into equilibrium
- dissociation constant the equilibrium constant for a reversible dissociation
- gas constant (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole