A measurement of the thermal dilatation of pure water has been made by detecting the change of buoyancy acting on a cylindrical hollow artifact made of fused quartz immersed in water between the temperatures of 0 °C and 44 °C. The formula for the thermal dilatation of water, free from air, is obtained in terms of the relative density ρ/ρ0 at the pressure of 101 325 Pa with an uncertainty of less than 1 ppm is as follows:
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Hideo Watanabe (1991) studied this question.
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