chocolate flows in a rectangular channel $($height $50$cm$,$ width $30$cm$)$ only fills $40\%$ of the height. the channel is very long, and the flow has reached steady state. given a specific gravity of $0\mathrm{.}85$ and velocity chocolate flows in a rectangular channel $($height $50$cm$,$ width $30$cm$)$ only fills $40\%$ of the height. the channel is very long, and the flow has reached steady state. given a specific gravity of $0\mathrm{.}85$ and velocity of $2$m$/$s$,$ calculate the lowest viscosity required to maintain a laminar flow.of $2$m$/$s$,$ calculate the lowest viscosity required to maintain a laminar flow.