Mu sayansi, entakyuka zikiikirira ebyekuuziza ku ""kalonda w’ebitonde"" (physical phenomena).Ekyokulabirako amazzi gekwata omuzira ku tempulikya eya nabwoko(dgrees) 32 Falenayiti oba nabwoki 0 (0 degrees) Selisiyaasi. Ekipimo ky'obwoki(tempulikya) kino amazzi we gekwatira omuzira kya ntakyuka(it is constant) kubanga kikakasiddwa nti amazzi gekwatira ku kipimo kya tempulikya kino kyokka.