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a salt of hydrofluoric acid; see hydrogen fluoridehydrogen fluoride,
chemical compound, HF, a colorless, fuming liquid or colorless gas that boils at 19.54°C;. It is miscible with water and is soluble in benzene, toluene, and concentrated sulfuric acid.
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. See also fluoridationfluoridation
, process of adding a fluoride to the water supply of a community to preserve the teeth of the inhabitants. Tooth enamel ordinarily contains small amounts of fluorides and when the amount is augmented through the intake of fluoridated water, especially during the
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; fluorinefluorine
, gaseous chemical element; symbol F; at. no. 9; at. wt. 18.9984; m.p. −219.6°C;; b.p. −188.14°C;; density 1.696 grams per liter at STP; valence −1. Fluorine is a yellowish, poisonous, highly corrosive gas.
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a compound of fluorine with other elements. The fluorides of elements in Groups I and II of Mendeleev’s periodic system are solids with an ionic element—fluorine bond; the fluorides of most elements in Groups VI–VII are gases with a covalent element—fluorine bond. Compounds containing a C—F bond form numerous classes of fluorocarbons; the higher fluorides of many metals, such as U, V, Mo, W, and Re, are volatile substances. Fluorides occur in nature as constituents of minerals. In terms of chemical properties, the fluorides of halogens, inert gases, oxygen, nitrogen, and many other elements in higher oxidation states (for example, PtF5, CoF3, and AgF2) are oxidizing agents; the fluorides of arsenic, antimony, and boron are strong Lewis acids (seeACIDS AND BASES).

Fluorides can be obtained by the interaction of fluorine with elements, by the action of hydrogen fluoride on metals, and by other methods.

Hydrogen fluoride, oxyfluorides, and nitrogen fluorine compounds are widely used. The chlorine fluorides C1F3 and C1F5 are rocket-fuel oxidizing agents; C1F3 also serves as a fluorinating agent in the preparation of uranium hexafluoride, UF6, which is used in the atomic industry for the isotope separation of uranium. The volatile fluorides of metals are used in the application of metallic coatings. The fluorides of lithium, magnesium, calcium, strontium, barium, and other metals are used as raw materials in the manufacture of optical glass. (See alsoCRYOLITE.)


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(inorganic chemistry)
A salt of hydrofluoric acid, HF, in which the fluorine atom is in the -1 oxidation state.


1. any salt of hydrofluoric acid, containing the fluoride ion, F--
2. any compound containing fluorine, such as methyl fluoride
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Algunas cartas de Lorenzo de Velez se encuentran en APF, SCAC, vol.
A former employee of APF was quoted as saying a plan to build housing for elderly people in Japan proceeded to a design stage but it was never built.
A block diagram representation of the p-q based APF using the STF is shown in Fig.
5 mL APF applied with a toothbrush (treatment group), and the group receiving 2 mL APF using a tray (control group) at any of the time points studied.
The APF outposts have been set up in dozens of places along Nepal-India and Nepal-China border to check cross-border criminal elements.
As Andrade and Scott had discussed from the outset, the APF was interested in more than simply farming out a large chunk of cash to a few independent managers.
The second study, using an in situ approach, provided initial data suggesting the combination of APF gel and daily use of 1,100 fluoride dentifrice increased fluoride concentration in biofilm fluid and reduced root dentin demineralization.
Three funding categories are the basis of the APF and NAF authorizations.
Just as APF had ignited some hopes of a come back Jeewan Sinkeman deflated them with a goal in the stroke of half time.
Since APF's inception in 1997, there have been considerable changes to the APF structure.
As the Francophonie's Consultative Assembly, the APF was founded to reflect and illustrate the cultural pluralism of the Francophone peoples of the world.
5 million individuals) report that they have experienced a problem with pain of some sort that persists for more than 24 hours, and that percentage does not account for those experiencing acute pain, the APF says.