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Pure de-aired water has a bulk modulus equal to approximately 2.2 GPa.

There is a common misconception that fluids are totally incompressible, however as can be seen from the above this is not true (if it were, the bulk modulus would be infinitely high). It is reasonable to state that water is highly resistant to compression however.

It should also be noted that the presence of dissolved gasses in water can significantly reduce this value so consider carefully the application or system being modelled before choosing an elastic modulus for water or any other fluid.

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15y ago

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