Fluid parcel

（重定向自Material line）

In fluid dynamics, within the framework of continuum mechanics, a fluid parcel is a very small amount of fluid, identifiable throughout its dynamic history while moving with the fluid flow. As it moves, the mass of a fluid parcel remains constant, while—in a compressible flow—its volume may change. And its shape changes due to the distortion by the flow. Note that in an incompressible flow the volume of the fluid parcel is also a constant (isochoric flow).

单词	Material line
释义	Material line 英语百科 Fluid parcel （重定向自Material line） In fluid dynamics, within the framework of continuum mechanics, a fluid parcel is a very small amount of fluid, identifiable throughout its dynamic history while moving with the fluid flow. As it moves, the mass of a fluid parcel remains constant, while—in a compressible flow—its volume may change. And its shape changes due to the distortion by the flow. Note that in an incompressible flow the volume of the fluid parcel is also a constant (isochoric flow).
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