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...Fundamentals of fluid mechanics chapter basic properties fluids main topics some characteristics dimensions and units analysis behaviors ideal gas law compressibility vapor pressure surface tension what s a difference between solid definition comprise the liquid or phase physical forms is substance that deforms continuously under application shear stress no matter how small may be shearing created whenever tangential force acts on when constant applied bends vague idea soft easily deformed hard not molecular structure has densely spaced molecules with large intermolecular cohesive allowed to maintain its shape further apart forces are smaller than for solids have more freedom movement at normal temperature spacing order mm number per cubic millimeter gases even greater motion negligible as consequence materials such slurries tar putty toothpaste so classified since they will behave if but exceeds critical value flow study called rheology...