For solids, elasticity means the recovery of original shape after stress is gone. What about fluids? They don’t have a fixed volume so is it probably that when the pressure is gone, the liquid recovers its original volume back? If so, then the bulk modulus (the inverse of compressibility) is the elasticity modulus for fluids?
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Liquids have surface tension and are always trying to form a shape with the least surface area. this and cohesion are the closest things to elasticity liquids have since they dont have a defined shape. both of these are pretty weak
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