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| Subject | English | Italian |
| transp., energ.ind. | F2 octane number | numero di ottano Motor |
| astr. | f-number | apertura angolare |
| comp., MS | f-number | numero di diaframma (In photography, the diameter of the aperture expressed in terms of the focal length of the camera lens. The greater the f-number, the less light reaches the film and the more in focus the objects in the foreground and the background will be. For example, with an f-number = 16 the objects in the far background will be in focus. Whereas, with an f-number = 2 the background will be blurry (while foreground objects are in focus)) |
| astr. | f-number | rapporto focale |
| chem. | the scum contained a considerable number of sulphate ions but no chloride ions %1F De Vries | il fango conteneva una grande quantità di ioni di solfato ma non conteneva ioni di chloruro |