stedy flow mass rate past apoint in a cloced duct can be found using the relationship is?

The relationship that can be used to find the steady flow mass rate past a point in a closed duct is the continuity equation, which states:

m_dot = ρ * A * V

Where:
m_dot = mass flow rate
ρ = density of the fluid
A = cross-sectional area of the duct
V = velocity of the fluid

This equation shows that the mass flow rate is equal to the product of the density of the fluid, the cross-sectional area of the duct, and the velocity of the fluid.

Q = \(\rho\)AV