F number (chemistry) - definizione. Che cos'è F number (chemistry)
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Cosa (chi) è F number (chemistry) - definizione

IS A NUMBER THAT CAN BE CALCULATED FOR POLYCYCLIC AROMATIC HYDROCARBONS FROM THEIR STRUCTURE

F number (chemistry)         
F number is a correlation number used in the analysis of polycyclic aromatic hydrocarbons (PAHs) as a descriptor of their hydrophobicity and molecular size. It was proposed by Robert Hurtubise and co-workers in 1977.
F-number         
  • Diagram of decreasing [[aperture]]s, that is, increasing f-numbers, in one-stop increments; each aperture has half the light-gathering area of the previous one.
  • Shallow focus with a wide open lens
  • 823 px
  •  A 1922 Kodak with aperture marked in U.S. stops. An f-number conversion chart has been added by the user.
  • Yashica-D TLR]] camera front view. This is one of the few cameras that actually says "F-NUMBER" on it.
  • From the top, the Yashica-D's aperture setting window uses the "f:" notation. The aperture is continuously variable with no "stops".
RATIO OF THE FOCAL LENGTH TO THE DIAMETER OF THE ENTRANCE PUPIL
F/stop; F stop; F number; F-stop; Focal ratio; F-Stop; F-Number; Relative aperture; F stops; T stop; Fstop; Relative Aperture; Working f-number; Tstop; Tstops; T-stops; T-stop; T stops; F-stops; F/number; Half stop; Stop number; T-stop system; F Number; F/; Ƒ-number; Transmission stop; T-number (photography); T number (photography); H stop; H-stops; H-stop; H stops; H number (photography); H-number (photography); F/11
In optics, the f-number of an optical system such as a camera lens is the ratio of the system's focal length to the diameter of the entrance pupil ("clear aperture").Smith, Warren Modern Optical Engineering, 4th Ed.
f-stop         
  • Diagram of decreasing [[aperture]]s, that is, increasing f-numbers, in one-stop increments; each aperture has half the light-gathering area of the previous one.
  • Shallow focus with a wide open lens
  • 823 px
  •  A 1922 Kodak with aperture marked in U.S. stops. An f-number conversion chart has been added by the user.
  • Yashica-D TLR]] camera front view. This is one of the few cameras that actually says "F-NUMBER" on it.
  • From the top, the Yashica-D's aperture setting window uses the "f:" notation. The aperture is continuously variable with no "stops".
RATIO OF THE FOCAL LENGTH TO THE DIAMETER OF THE ENTRANCE PUPIL
F/stop; F stop; F number; F-stop; Focal ratio; F-Stop; F-Number; Relative aperture; F stops; T stop; Fstop; Relative Aperture; Working f-number; Tstop; Tstops; T-stops; T-stop; T stops; F-stops; F/number; Half stop; Stop number; T-stop system; F Number; F/; Ƒ-number; Transmission stop; T-number (photography); T number (photography); H stop; H-stops; H-stop; H stops; H number (photography); H-number (photography); F/11
¦ noun Photography a camera setting corresponding to a particular f-number.

Wikipedia

F number (chemistry)

F number is a correlation number used in the analysis of polycyclic aromatic hydrocarbons (PAHs) as a descriptor of their hydrophobicity and molecular size. It was proposed by Robert Hurtubise and co-workers in 1977.