A rectangular block below of height L and horizontal cross-sectional area A floats at the interface between two immiscible liquids:  Derive a formula for block density(ρb), in terms of the fluid densities ρ1 and ρ2, heights h0 and h1, and the cross-sectional area A. (Note, all variables may not appear in the final result).

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.