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The upthrust exerted on a steel ball which is immersed in paraffin of
temperature 20 °C is 0.2145 N, and 0.200 N when the temperature of the paraffin is
100 °C:. Based on this measurement, find the volumetric thermal expansion cocfficient
of paraffin if the coefficient of linear thermal expansion of steel is 1.2.10-5 1/°C.

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