It's a question about fluid dynamics. Explain the following terms, it must include all the evalution criteria.

2) The significance of the following relation where T is the surface force per unit area acted by surrounding on the surface of the body, and n is the outgoing unit normal vector from the body surface. (10 pts) =nT (evaluation criteria) - Body and contact stress (pressure and viscous stresses) - Stress tensor (surface-dependency) - Gauss's divergence theorem for force balance