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Introduction to Dimensions and units – Physical properties of fluids specific gravity, viscosity, surface tension, vapor pressure and their influences on fluid motion pressure at a point, Pascal’s law, Hydrostatic law – atmospheric, gauge and vacuum pressure- measurement of pressure. The zone behind it is backfilled with clean sand. Your common sense will tell you that the sand will exert some lateral force on the wall. You can also see that the only cause of this lateral force has to be the weight of the retained sand, or the force of gravity. If the sand were a fluid, it would be a simple problem of hydrostatics. A fluid is shear thickening if the viscosity of the fluid increases as the shear rate increases (see Figure 2). A common example of shear thickening fluids is a mixture of cornstarch and water. You have probably seen examples of this on TV or the internet, where people can run over this kind of solutions and yet, they will sink if they stand still.