fluoride

/floor-ahyd, flawr-, flohr-/US // ˈflʊər aɪd, ˈflɔr-, ˈfloʊr- //UK // (ˈflʊəˌraɪd) //

氟化物,氟化,氟化物,氟

Definitions

n.名词 noun

1
Chemistry.
- : a salt of hydrofluoric acid consisting of two elements, one of which is fluorine, as sodium fluoride, NaF.
- : a compound containing fluorine, as methyl fluoride, CH3F.

If you’re more prone to cavities, toothpastes and mouth rinses that contain fluoride may be better.
Especially if your mouthwash contains fluoride, you’ll want the wash to sit on your teeth as you go about your day.
As an example of good science-and-society policymaking, the history of fluoride may be more of a cautionary tale.
Fluoride first entered an American water supply through a rather inelegant technocratic scheme.
Really, is it any wonder that fluoride should freak people out?
And, in the case of fluoride, at least, that doubt might actually be justified.
Placed in drinking water, fluoride can serve people who otherwise have poor access to dental care.
Put into this vessel a small quantity of fluoride of calcium, and mix it with sulphuric acid.
Acid sulphuric, a sufficient quantity to decompose the ammonia fluoride and making the mixture of a semi-fluid consistency.
It attacks silica, forming fluoride of silicon, which is a gas.
Calcium fluoride must be first converted into sulphate by evaporation in a platinum dish with sulphuric acid.
It occurs less abundantly as cryolite (Na3AlF6), a fluoride of aluminium and sodium, which is used in glass-making.