The equivalent conductivities Λ of dilute aqueous solutions of several concentrations of KCl (to 750°C and 6 kbar), BaCl 2 (to 760°C and 6 kbar), Ba(OH) 2 (to 760°C and 6 kbar) and MgSO 4 (to 350°C and 6 kbar) are given. With 0.01 molal KCl-solutions Λ attains a...