# Definition:Density (Physics)/Linear

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## Definition

The **linear density** of a one-dimensional body is its mass per unit length.

The usual symbol used to denote **linear density** is $\mu$ (Greek letter **mu**).

Sometimes $\lambda$ (Greek letter **lambda**) is also used.

### Dimension of Linear Density

The dimension of **linear density** is $M L^{-1}$: mass per unit length.

### Units of Linear Density

- The CGS units of
**density**are $\mathrm g \ \mathrm{cm}^{-1}$ (grams per centimetre).

Thus:

- $1 \ \mathrm{kg} \ \mathrm m^{-1} = 10 \ \mathrm g \ \mathrm{cm}^{-1}$