Nder karnuwol 19th ɗum fu'itii ummitinki nder jamanu daga kiimiiyaaku'en feerefeere'en bano ko hawti: Jöns Jacob Berzelius (1834), Kelvin (1871), Hermann von Helmholtz (1879) e, ɓaawoɗon, daga Svante Arrhenius (1903).