Measurements of the viscosity of water under shock compression

The results of measurements of the shear viscosity of shock-loaded water, obtained by the method of decay of perturbations on a corrugated shock front suggested by Sakharov et al. [1], are treated in the light of new data on the phase diagram of water. The experimental data on viscosity in the pressure range from $4$ to $25$ GPa are compared to the results of measurements by other methods. The high values of viscosity at high pressures are attributed to the formation a water-ice VII mixture under shock compression of water.