Which one of the following is the model scale for a situation where both viscous and gravity forces are predominant, if kinematic viscosity of model and prototype fluids are 0.9 stokes and 7.2 stokes respectively?

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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.