1. solar constant the rate at which radiant solar energy is received at the outer layer of the earth's atmosphere
  2. color constancy the tendency for a color to look the same under widely different viewing conditions
  3. velar consonant a consonant produced with the back of the tongue touching or near the soft palate
  4. colour constancy the tendency for a color to look the same under widely different viewing conditions
  5. self-consistent not self-contradictory
  6. constant uninterrupted in time and indefinitely long continuing
  7. 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
  8. nasal decongestant a decongestant that provides temporary relief of nasal symptoms of the common cold and rhinitis and upper respiratory infections
  9. inconstant likely to change frequently often without apparent or cogent reason; variable
  10. 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
  11. 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
  12. alveolar consonant a consonant articulated with the tip of the tongue near the gum ridge
  13. 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
  14. size constancy the tendency to perceive the veridical size of a familiar object despite differences in their distance (and consequent differences in the size of the pattern projected on the retina of the eye)
  15. rydberg constant a wave number characteristic of the wave spectrum of each element
  16. polar coordinate either of two values that locate a point on a plane by its distance from a fixed pole and its angle from a fixed line passing through the pole
  17. Lake Constance a lake in southeastern Germany on the northern side of the Swiss Alps; forms part of the Rhine River
  18. Planck's constant the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
  19. 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)
  20. cosmological constant an arbitrary constant in the equations of general relativity theory

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