Question 8 / 40:  Which of the following best characterizes a "fluid"?
A  A fluid flows under the influence of a pressure gradient.
B  A fluid deforms in response to stress.
C  A fluid has viscosity.
D  A fluid ceases to flow if there is no pressure gradient.
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Explanation:

Superfluids have zero viscosity. Pressure gradients are not the only sources of stress. A fluid deforms continuously when subject to a shear stress. See subunit 1.1.

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Fluid Mechanics ME201

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Attribution:  Stephanie Redfern and Tuan Dinh. Fluid Mechanics. The Saylor Academy 2014, http://www.saylor.org/courses/me201/
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