---
title: "Which unit does the \"strain\" have?"
description: Spellings and units for "strain"
---

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# Which unit does the "strain" have?

## Spellings and units for "strain"

The unit of strain is meters per meter: \[m/m\]

Since the change in length Δl is very small compared to the original length l0, the strain ε is often given in microns per meter: \[μm/m\].

If the unit m/m is reduced, 10-6 or "parts per million" (ppm) remain. The elongation is also expressed in percent (‰) or in percent (%).

In the US, the unit "microepsilon" or "microstrain" \[με\] stands for 1 μm/m  
*10-6m/m=1ppm=1μm/m=1μϵ=10-3‰=10-4%*

 

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