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How much of an impact has a temperature difference when the specific weight of an object in water is measured, e.g. the weight of a mussel in seawater. Would the two scenarios yield the same specific weight and if not is there a way to correct the specific weight for the temperature difference?

  1. Seawater 11 degree Celsius and mussel 11 degree Celsius
  2. Seawater 21 degree Celsius and mussel 11 degree Celsius
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Assuming the temperature of the mussel has not changed during the course of the measurement, obviously not. You have to correct for the variation of the density of seawater.

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  • $\begingroup$ Thank you for your answer Dr S T Lakshmikumar. Would the specific weight stay constant if the temperatures of the water and the mussel change at the same rate, so that the temperature difference stayed the same e.g. 10 - 15 and 15 - 20 degree Celsius)? $\endgroup$ – Globoquadrina Jan 5 at 17:07
  • $\begingroup$ Not likely. You would need the changes in densities of sea water and the mussel to match and there is no physical reason why they should $\endgroup$ – Dr S T Lakshmikumar Jan 7 at 10:36

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