Various astrophysical phenomena are powered by the accretion onto black holes. Black holes draw matter in, i.e., accrete, with its gravity,

and matter gets heated to produce radiative or kinetic energy. The geometrical and physical characteristic of these accretion flow are diverse: spherical or disk-like,

hot or cool, optically thin or thick, radiatively efficient or inefficient, with or without outflow. They can have very different radiative efficiency.

The mass accretion rate also depends on the physical state of gas outside the Bondi radius where the effect of gravity becomes comparable to that of gas pressure.

We have shown and want to point out that the angular momentum of gas affects the accretion rate significantly in addition to its density and temperature.