Consider an infinitesimally small fluid element with density (of dimensions dx, dy and dz with mass m and volume V) moving along with the flow with a velocity ( vec{V}=u vec{i}+v vec{j}+w vec{k} ). What is the time rate of change of mass of this element?

( frac{ partial( rho delta m)}{ partial t} )

( frac{ partial( rho delta V)}{ partial t} )

Consider an infinitesimally small fluid element with density (of dim

1.	Consider an infinitesimally small fluid element with density (of dimensions dx, dy and dz with mass m and volume V) moving along with the flow with a velocity ( vec{V}=u vec{i}+v vec{j}+w vec{k} ). What is the time rate of change of mass of this element?
A.	( frac{D( rho delta V)}{Dt} )
B.	( frac{ partial( rho delta m)}{ partial t} )
C.	( frac{ partial( rho delta V)}{ partial t} )
D.	( frac{D( rho delta m)}{Dt} )
Answer» B. ( frac{ partial( rho delta m)}{ partial t} )

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