ENB205 Lecture Notes - Lecture 2: Toothpaste, Partial Pressure, Surface Tension

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Deforms under the action of a shear force. Deforms (flows) under the action of a shear force. Flows under the action of their own weight. Takes the shape of any solid body it is in contact with. A fluid is a substance which deforms continuously under the action of shearing forces, however small they may be. Conversely: if a fluid is at rest, there can be no shearing forces acting upon it, therefore, all forces must be perpendicular to the places upon which they act. Difficult to compress, leads to the commonly used assumption of an incompressible fluid. Easy to compress so changes of volume with pressure are large and cannot be neglected. A given mass of liquid occupies a fixed volume, A given mass of gas will expand continuously irrespective of size and shape of container unless restrained. Takes the shape of a container and forms a free.

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