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

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Example Sentences

See Examples For:

thoria

By experiment it was determined that the best proportions for the rare-earth content are one part of ceria and ninety-nine parts of thoria.

From Artificial Light Its Influence upon Civilization by Matthew Luckiesh

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 Matthew Luckiesh

In other words, it is easier to accelerate the motion of the corpuscles in ceria, thoria and the other ingredients of the mantle, than it is those of carbon.

From Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science by Thomas W. Corbin

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

Other authorities hold that mantles for acetylene, should contain other rare earths besides the thoria and ceria of which the coal-gas mantles almost wholly consist.

From Acetylene, the Principles of Its Generation and Use A Practical Handbook on the Production, Purification, and Subsequent Treatment of Acetylene for the Development of Light, Heat, and Power by F. H. (Frank Henley) Leeds

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