fluorine
氟,氟元素,氟化物,氟素
Definitions
- 1
Chemistry.
- : the most reactive nonmetallic element, a pale-yellow, corrosive, toxic gas that occurs combined, especially in fluorite, cryolite, phosphate rock, and other minerals. Symbol: F; atomic weight: 18.9984; atomic number: 9.
Examples
Fifty-two percent of those products contained a high fluorine level, suggesting it contained at least one PFAS.
Adding fluorine to fentanyl showed increased opioid activity in the more acidic conditions of injured tissue compared to healthy tissue.
Over the last three years, researchers tested 231 cosmetics products in North America for fluorine, an indicator of per- and polyfluoroalkyl substances, or PFAS.
Long-lasting or waterproof products were especially likely to contain lots of fluorine.
Among over 200 tested beauty products, about half contained high levels of fluorine — a marker for potentially harmful PFAS compounds.
Calcium also occurs, combined with fluorine, in the mineral fluor (CaF2).
Fluorine is frequently met with as calcium fluoride or fluor-spar (CaF2).
If the substance contained fluorine, the characters will be found permanently etched on the glass.
The increase in weight multiplied by 0.655 gives the weight of fluorine.
The loss in weight gives that of the silicon fluoride (SiF4), which, multiplied by 0.7307, gives the weight of fluorine.