| F | the 6th letter of the Roman alphabet |
|---|---|
| F | the capacitance of a capacitor that has an equal and opposite charge of 1 coulomb on each plate and a voltage difference of 1 volt between the plates |
| F | a degree on the Fahrenheit scale of temperature |
| F | a nonmetallic univalent element belonging to the halogens |
| F | of a temperature scale that registers the freezing point of water as 32 degrees F and the boiling point as 212 degrees F at one atmosphere of pressure |
| F | a clef that puts the F below middle C on the fourth line of a staff |
| F | the highest region of the ionosphere (from 90 to 600 miles up) that contains the highest concentration of free electrons and is most useful for long-range radio transmission |
| F | the ratio of the focal length to the diameter of a (camera) lens system |
| F | the highest region of the ionosphere (from 90 to 600 miles up) that contains the highest concentration of free electrons and is most useful for long-range radio transmission |
| F | (metallurgy) |
| F | Canadian physiologist who discovered insulin with C. H. Best and who used it to treat diabetes(1891-1941) |
| F | United States novelist (1896-1940) |