Saan 19ɛmɛ kɛmɛsi, a lakurayara tuguni cɔgoya kura la lɔnnibaga caman fɛ, in'a fo Jöns Jacob Berzelius saan (1834), Kelvin (1871), Hermann von Helmholtz saan (1879) ani, wati laban na, Svante Arrhenius fɛ saan (1903).