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| the branch of physics that deals with sound and sound waves |
| one of the units, as mass, length, time, or electric current, taken as a basis for a system of units in the sciences |
| Poisson's ratio | |
| —n | |
| μ, ν a measure of the elastic properties of a material expressed as the ratio of the fractional contraction in breadth to the fractional increase in length when the material is stretched | |