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microstrain (plural microstrains)

  1. (physics) A strain expressed in terms of parts per million
  2. (materials science) The microstrain is the root mean square of the variations in the lattice parameters across the individual crystallites, usually accross microscopic distances, <ϵ2>1/2. By definition, it cannot be negative. In conrast, macrostrain refers to the overall change in the lattice parameters caused by a composition chnge or temperaure change or pressure change.

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