By setting the expression for drag force equal to the expression for gravitation force, determine the equation for the terminal settling velocity vt.  You can assume that the mass of a spherical particle with diameter dp is equal to the volume of a sphere multiplied by the particle density ρp.

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.