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Possible deformation of a volume element of an incompressible substance
Incompressibility therefore stands for the approximation of an infinitely low compressibility or an infinitely high compression modulus. Rubber is often considered incompressible because its compression modulus is very large compared to its shear modulus .
Compared to gases , liquids and solids are often viewed as incompressible. At normal pressure, most liquids are 1000 to 10,000 times less compressible than gases, and solids are usually ten times less compressible.
Incompressible bodies do not experience any change in volume due to a change in pressure, but they can experience a change in shape .
This relationship is called freedom from divergence , since the divergence represents the flow velocity.
The picture tries to clarify this connection: e.g. a bilateral horizontal flow with the velocity components and into the volume element causes a simultaneous vertical flow with the velocity component out of the volume element.