# Translations:Wave velocity/6/en

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is a relationship between the shear velocity, , and the compressional velocity, , in terms of Poisson’s ratio. In an ideal elastic solid, Poisson’s ratio equals 0.25, and . Steel is a good example of an ideal solid. Poisson ratios for rocks vary in the range of ~0.2 to ~0.4. The upper bound on Poisson’s ratio is 0.5. For that value, is zero, and there are no shear waves. That is the condition that holds for fluids and gases.