What is momentum flux unit?

Momentum flux unit is a measure of the transfer of momentum across a surface. It is commonly used in fluid mechanics to quantify the forces acting on a body in a fluid flow. The unit of momentum flux is typically expressed in Newtons per square meter (N/m²) or Pascal seconds (Pa⋅s). The term momentum flux is often used to describe the rate of change of momentum of a fluid flowing through a given area. Momentum flux can be expressed in terms of the velocity, density, and viscosity of the fluid, as well as the size and shape of the surface over which the momentum is being transferred. A higher momentum flux indicates a greater transfer of momentum and a greater force acting on the surface.