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In fluid dynamics, a fluid parcel, also known as a fluid element or material element, is an infinitesimal volume 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 distortion by…
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fluid parcel parcels also flow volume particles material frame reference dynamics constant mathematical concept continuum distinguished properties small infinitesimal mass
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