Water containing 50 mg/L of monodisperse (uniformly sized) spherical particles of diameter 100 μm flows at a rate of 25 m3/h into a cylindrical tank with a depth of 5 m and a volume of 50 m3. The density of each particle is 2.5 g/cm3. The water temperature is 20 C (density = 1.0 g/cm3, viscosity = 0.01 g/cm-s). The only removal process that influences the particles within the tank is gravitational settling. Determine the outlet concentration (mg/L) of the particles.

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.