thoria

American  

[thawr-ee-uh, thohr-] / ˈθɔr i ə, ˈθoʊr- /

noun

Chemistry.

1. a white, heavy, water-insoluble powder, ThO 2 , used chiefly in incandescent mantles, as the Welsbach gas mantle.

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thoria British  

/ ˈθɔːrɪə /

noun

1. another name for thorium dioxide

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Etymology

Origin of thoria

First recorded in 1835–45; thori(um) + -a ⁴

Example Sentences

The best results are obtained from a mixture of 99 parts thoria and 1 part ceria.

From Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries by Slosson, Edwin E.

It has been found that a mantle in which thoria is used alone is a poor light-source, but that when a small amount of ceria is added the mantle glows brilliantly.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew

Later lamps consisted of "glowers" about one inch long made from a mixture of zirconia and yttria, and finally a mixture of ceria, thoria, and zirconia was used.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew

The specific gravity of pure thoria is 10.2207 to 10.2198.

From Scientific American Supplement, No. 365, December 30, 1882 by Various

Much the best practical source of helium is thorianite, a mineral imported from Ceylon for the manufacture of thoria.

From Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" by Various