Tyndalln.
/ˈtɪndəl/ Used attributively with reference to the scattering of a beam of light by small particles and the blue colour that the scattered light often has (described by Tyndall in 1869).
ΘΚΠ
the world > matter > physics > electromagnetic radiation > light > refraction > [adjective] > scattering
scattering1808
Tyndall1910
1910 H. H. Hodgson tr. Pöschl Introd. Chem. of Colloids ii. 12 The Tyndall effect is the basis of ultra~microscopy.
1915 M. H. Fischer tr. W. Ostwald Handbk. Colloid-chem. 8 Liquids which show no definite Tyndall light-cone..are molecular-disperse solutions.
1925 G. Barger tr. H. Freundlich Elem. Colloid Chem. 125 All colloidal solutions with colourless particles show a blue Tyndall light.
1939 H. B. Weiser Colloid Chem. xii. 160 There is no pigment in blue eyes; the color is a Tyndall blue which is more intense the finer the particles that give rise to the blue color.
1964 Oceanogr. & Marine Biol. 2 366 With the searchlights [of the bathyscaph] on, it is possible to discern very minute particles..by the Tyndall effect.
1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) XIV. 169/1 In aqueous gold sols..strong Tyndall cones are observed.
1971 Nature 19 Feb. 573/1 Drops smaller than 1 μm form a ‘blue haze’ due to selective Tyndall scattering of shorter light wavelengths.
Derivatives
ˈTyndallmeter n. (also as two words; also Tyndaˈllometer) an instrument that makes use of the Tyndall effect for measuring aerosols and suspensions.
ΘΚΠ
the world > matter > gas > air > [noun] > air in any specific place or at specific time > measurement of specific quality of air > instruments for measuring specific qualities
eudiometer1777
oximeter1803
ozonometer1851
ozonoscope1872
sepometer1876
koniscope1892
formenophone1894
konimeter1918
Tyndallmeter1919
1919 Tolman & Vliet in Jrnl. Amer. Chem. Soc. XLI. 297 (heading) A Tyndallmeter for the examination of disperse systems.
1937 Nature 25 Sept. 553/1 The hygienic importance of the reduction of dust lends interest to means for its measurement, and the Tyndallometer shown by E. Leitz (London) provides a new and rapid means of its measurement.
1957 H. C. van de Hulst Light Scattering by Small Particles xix. 405 This problem, of obvious importance in the testing of gas masks, was studied by Gucker and by O'Konski. A Tyndall meter is insufficient for the concentrations of 10−9g/liter and lower that have to be investigated.
This entry has not yet been fully updated (first published 1986; most recently modified version published online September 2018).
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n.1910