Muchidzidzo Fundoyetsimba, (Physics), puresha (Pressure) izwi rinotsanangudza huhwandu hweFosi iri kudzvanya pamusoro penharaunda yakapimwa. Puresha inopimwa nechiyero chinonzi Pascal kana kuti N/m2. Puresha inopimwa nerudzivo rwakarurama panharaunda yakadzvanyiwa nepuresha yacho. Ngatiti semuenzaniso pane zviumbwa zviviri chimwe nechimwe chine huremu hwe 100kg. Ngatitiyi chiumbwa chekutanga chakagara pauso hune nharaunda yakakura 1m2, chepiri chakagara pauso hune nharaunda yakakura 0,5m2. Zviumbwa zviviri zvinondonzwa neFosi yegunganidzo yakaenzana nokuda kwehuremu hwakaenzana. Asi chiumbwa chakagara pauso hudiki hwakakura 0,5m2 ndicho chinodzvanya nepuresha yakakura. Tsazaniso yepuresha inoti, Puresha, P = (Fosi)/(Nharaunda) Saka puresha iri pachiumbwa chekutanga = (100 x 9.8)/(1) = 980 N/m2 Puresha iri pachiumbwa chepiri = (100 x 9.8)/(0.5) = 1960 N/m2 Herero vanoti oku-ninikiza (n. pressure). Mamwe mazwi: ninikiza (pressure towards). Herero vanoti oma-ninikiziro (n. trouble; pressure).