Scientific Ontology

\varepsilon

Mechanics

Strain

Fractional extension; ratio of change in length to original length.

dimensionless (—)

Dimension: $[\,1\,]$

How values of strain span the physical world (in —, log scale).

Steel at yield

10^-3 —

Rubber band

5.00 × 10^-1 —

Lower limit10^-6 —Upper limit10⁰ —

Young Modulus

E = \dfrac{\sigma}{\varepsilon}

Tensile Strain

\varepsilon = \dfrac{\Delta x}{x}