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AbslncL m i s paper reports the mulls of a vplematic study of the 9.355 GHz mmplex permittivity of doubledislilled, deionized water over the temperalure interval from I s ) lo Ws) in -2 s ) steps. A precision of -0.03% and an accuracy of -0.1% -re achieved lor both lhe permitlinty 6 ' and Ihe dielectric lw e": r'(T) = 43.789(18) + 1.4098(18)T -3.008(26) x 10-z'Tz + 2.249(71) x IO-%"' -2.33(8.5) x lO-'~-3.14(36) x 10-9Ts; r"(T) = 39.9615(91)l.77(20) x 10-"7'-3.350(13) x 10-zTz+8.387(36) x 10-"T3-8.470(42) x 10-6T'+3.146(18) Y 10-8Ts where T is in T. It shows lhal the values of the thermodynamic pwameters envow (AS), enthalpy (AH), and h e energy (AF) of activation are temperature dependenl, mnlrary U) previous reportr The temperalure dependence of the relaxation time in this temperalure interval b in good agmmenl with thal reponed in the lileralure. ?he values of the thermodynamic functions, calculaled using the various pain of a and cm values reponed in Ihe litemlure. agree within lo over most of the measuremenl temperalure interval.