- For other meanings of density, see Density (disambiguation)
Linear density, linear mass density or linear mass is a measure of mass per unit of length, and it is a characteristic of strings or other one-dimensional objects. The SI unit of linear density is the kilogram per metre (kg/m). It is defined as:
- <math>\mu = \frac{\partial m}{\partial x}</math>
where μ is the linear density of the object, m is the mass, and x is a coordinate along the (one dimensional) object. For the common case of a homogenous substance of length L and total mass m, this simplifies to:
- <math>\mu = \frac{m}{L}</math>
The term linear density also refers to how dense a line is drawn.
Units
Common units include:
- denier
- dtex (decitex) - Unit of the SI
- kilogram per metre
- ounce (mass) per foot.
- ounce (mass) per inch
- pound (mass) per foot
- pound (mass) per inch
