The absorption and velocity of ultrasound at 21 MHz and the shear viscosity were measured for water solutions of poly (sodium 4‐styrenesulfonate) as a function of concentration and temperature. The molecular weight of the polymer is 70 000. The concentrations used were 1%, 5%, and 9% by weight, and the temperatures were 25, 30, 35, 40, and 45 °C. The absorption or α/f2decreases almost linearly with increasing temperature at a given concentration and increases with concentration at a given temperature. The velocity is a linearly increasing function of the temperature and also increases with concentration at a given temperature. In addition, the shear viscosity decreases linearly with temperature and increases with concentration.