Linear mass density
= Linear mass density
{title2=$\mu=dm/d\ell$}
Linear mass density is <mass> per unit <length>, measured in $\mathrm{kg\,m^{-1}}$. A uniform string of mass $m$ and length $L$ has $\mu=m/L$; with constant <tension> $T$, its transverse <wave> speed is $\sqrt{T/\mu}$. <Mass density> instead measures mass per unit <volume>.