thoria

/thawr-ee-uh, thohr-/US // ˈθɔr i ə, ˈθoʊr- //UK // (ˈθɔːrɪə) //

钍,茉莉花,茉莉花香,茉莉花茶

Definitions

n.名词 noun

1
Chemistry.
- : a white, heavy, water-insoluble powder, ThO2, used chiefly in incandescent mantles, as the Welsbach gas mantle.

Thoria which has been ignited is not readily soluble in acids.
Dissolve; and from the hydrochloric acid solution precipitate the thoria (if any) with ammonium oxalate.
With thoria the shrinkage is smaller than with any other known substance, and it possesses very high refractory powers.
Much the best practical source of helium is thorianite, a mineral imported from Ceylon for the manufacture of thoria.