the reciprocal of the dispersive power of a substance.
noun, Statistics. 1. the ratio of the number of times an event occurs to the number of occasions on which it might occur in the same period. relative frequency noun 1. the ratio of the actual number of favourable events to the total possible number of events; often taken as an estimate of probability the […]
noun 1. the amount of water vapor in the air, expressed as a percentage of the maximum amount that the air could hold at the given temperature; the ratio of the actual water vapor pressure to the saturation vapor pressure. Abbreviation: RH, rh. relative humidity noun 1. the mass of water vapour present in the […]
noun, Law. 1. a fact or circumstance that disqualifies from lawful marriage persons who are closely related.
noun, Optics. 1. See under index of refraction. index of refraction noun, Optics. 1. a number indicating the speed of light in a given medium as either the ratio of the speed of light in a vacuum to that in the given medium (absolute index of refraction) or the ratio of the speed of light […]