Accretion rate
= Accretion rate
{title2=$\dot M$}
The accretion rate is the mass crossing an inward-oriented cylindrical surface per unit time. A common convention takes $\dot M>0$ for inward flow, so the outward radial mass flux is $-\dot M$.
= Accretion rate
{title2=$\dot M$}
The accretion rate is the mass crossing an inward-oriented cylindrical surface per unit time. A common convention takes $\dot M>0$ for inward flow, so the outward radial mass flux is $-\dot M$.