Typical processes often run almost isothermally, and in these cases the effect of temperature can be ignored. The density of gases depends almost directly on the absolute pressure for most other cases, the effect of pressure on physical properties can be disregarded. For liquids, viscosity also depends strongly on the temperature for gases, viscosity is approximately proportional to the square root of the absolute temperature. The physical properties depend primarily on the particular fluid. Each of these will be defined and viewed briefly in terms of molecular concepts, and their dimensions will be examined in terms of mass, length, and time (M, L, and T). There are three physical properties of fluids that are particularly important: density, viscosity, and surface tension. Learn More Buy 1.4 Physical Properties-Density, Viscosity, and Surface Tension Fluid Mechanics for Chemical Engineers: with Microfluidics, CFD, and COMSOL Multiphysics 5, 3rd Edition
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