- We can evaluate Newton's Second Law for the infinitesimal section of fluid diagrammed in Fig. 2.
- If the fluid has a mass density and cross-sectional area
*A*, the section mass is given by . - From Newton's Second Law (
*F*=*ma*), we then have:

where*v*is particle velocity. - From this expression, we find:

(1) - Converting to an expression for volume velocity (
*u*=*A v*), we find:

(2)

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