![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Tidens_naturl%25C3%25A6re_fig40.png/640px-Tidens_naturl%25C3%25A6re_fig40.png&w=640&q=50)
Fon (jedinica)
From Wikipedia, the free encyclopedia
Fon (grč. φωνή: glas) (oznaka "ph") je brojčana jedinica razine glasnoće, određena logaritmom omjera tlakova opaženog zvuka p i usporedbenog zvuka p0 = 2 · 10–5 Pa, to jest razina je tlaka p prema usporedbenom tlaku:[1]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Tidens_naturl%C3%A6re_fig40.png/640px-Tidens_naturl%C3%A6re_fig40.png)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/8/82/Spherical_pressure_waves.gif/320px-Spherical_pressure_waves.gif)
![Thumb image](http://upload.wikimedia.org/wikipedia/hr/thumb/e/e3/Razina_glasno%C4%87e_1.png/640px-Razina_glasno%C4%87e_1.png)