Refractivity sentence example

refractivity
  • The refractivity of helium is 0.1238 (air =1).

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  • Boron dissolves in molten aluminium, and on cooling, transparent, almost colourless crystals are obtained, possessing a lustre, hardness and refractivity near that of the diamond.

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  • He introduced the idea of comparing the refractivity of equimolecular quantities of different substances by multiplying the function (n-1)/d by the molecular weight (M) of the substance, and investigated the relations of chemical grouping to refractivity.

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  • In air and other gases, at ordinary pressures, the dispersion is very small, because the refractivity is small.

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  • Glasses can now be made differing considerably both in refractivity and dispersive power.

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  • If the powder of a transparent substance is immersed in a liquid of the same refractive index, the mixture becomes transparent and a measurement of the refractive index of the liquid gives the refractivity of the powder.

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  • Christiansen found, in an investigation of this kind, that the refractivity of the liquid could only be got to match that of the powder for mono-chromatic light, and that, if white light were used, brilliant colour effects were obtained, which varied in a remarkable manner when small changes occurred in the refractive index of the liquid.

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  • In this case small temperature changes alter the refractivity of the liquid without appreciably affecting the quartz.

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  • Such stones have been occasionally cut as lenses for microscopes, being recommended for such use by their high refractivity, weak dispersion and great hardness.

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  • The refractivity of argon is 961 of that of air.

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  • This low refractivity is noteworthy as strongly antagonistic to the view at one time favoured by eminent chemists that argon was a condensed form of nitrogen represented by N3.

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