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Table 1 Physical quantities and corresponding symbols used in mathematical formulation of conservation equations

From: Development of a theoretical framework for analyzing cerebrospinal fluid dynamics

Physical Quantity

Symbol

Fluid mass density

ρ

Velocity vector field

u

Net mass production rate

Pressure field

p

Viscous stress vector

τ

Gravitational acceleration

g

Control volume acceleration

a

Ventricle wall displacement vector

δ w

Differential volume element

dV

Differential control surface area element

dS

Unit outward surface normal vector