The fluid displacement technique is used to find the porosity of a certain core sample. The sample is first coated with paraffin (density of 0.9 g/cm3) and submerged in a beaker filled with water (density 1 g/cm3), where the volume of water before and after submerging the sample is recorded. Then, the paraffin is removed, the sample is saturated with water and then weighed. The following information is given for the sample:   - Dry weight of the core = 140.2 g - Weight of the core with paraffin = 145.6 g - Initial volume in the beaker = 242.5 cm3 - Final volume in the beaker = 318.0 cm3 - Weight of the core saturated with water = 156.8 g

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Fluid Materials

In general terms, anything that flows can be termed as a fluid. In other words, a fluid is any substance that cannot resist shear forces and deforms continuously under the application of external shear forces. Fluid materials differ completely from solid materials such as metals and alloys. For instance, if we consider two infinitesimally small cross-sectional areas of fluid materials and solid materials, and apply shear forces to these elements, both the elements will undergo deformation. Upon releasing the shear force, the element of the solid materials will regain its original orientation, but the element of the fluid materials will keep on deforming continuously under the action of the shear force.