dispersivityn.
/dɪspəːˈsɪvɪti/ a. The degree to which the refractive index of a substance varies with the wavelength of the light refracted; a numerical measure of the rate of change of refractive index with wavelength.
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the world > matter > physics > electromagnetic radiation > light > chromatism > [noun] > variation in wavelength
monochromaticity1907
dispersivity1913
the world > matter > physics > electromagnetic radiation > light > refraction > [noun] > index of refraction > variation in
dispersivity1913
1913 J. B. Cohen Org. Chem. Adv. Students II. iv. 296 The difference between the specific refractivities for light of widely different wave length is called the specific dispersive power or dispersivity.
1947 Nature 25 Jan. 114/1 Christiansen filters consist essentially of a powdered solid immersed in a liquid of similar refractive index but different dispersivity.
b. The degree to which one substance is dispersed in another, e.g. in a colloid.
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the world > matter > chemistry > physical chemistry > colloid > [noun] > polydispersity > dispersivity
dispersivity1984
1984 Oil & Gas Jrnl. 30 July 175 The way to study the ‘dispersivity’ of these clays is with a combination of the filtration time method and the zeta potential technique.
This entry has not yet been fully updated (first published 1989; most recently modified version published online June 2019).
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