Buuxi weedhan soo socota: Nidaamka BA ee cutubyada la taaban karo wuxuu helay taageero caalami ah oo la taaban karo, waxaana la ansixiyay <unk> hal wax ka bedel muhiim ah <unk> by
Shirkii ugu horeeyay ee caalamiga ah ee korontada (Paris, 1881). Ururka Ingiriiska wuxuu dhisay matalaad farshaxan oo ah ohm (dhererka caadiga ah ee siligga iska caabinta oo leh iska caabin ah 109 CGS oo iska caabin koronto ah, taasi waa hal ohm) halka shirweynaha caalamiga ahi uu doorbiday habka xaqiijinta ee lagu soo celin karo shaybaarro kala duwan oo ku yaal dalal kala duwan. Habka la doortay wuxuu ku salaysnaa iska caabinta mercury, iyadoo la cabbirayo iska caabinta tiir mercury ah oo cabirkeedu cayiman yahay (106 cm × 1 mm2): si kastaba ha noqotee, dhererka la doortay ee tiirka ayaa ku dhowaad 3 milimitir ka gaaban, taasoo keentay farqi dhan 0.28% oo u dhexeeya unugyada cusub ee wax ku oolka ah iyo unugyada CGS ee loo malaynayo inay aasaas u yihiin.