An open cylindrical vessel $($both ends$)$ with a diameter of $500$ mm and length of $1\mathrm{.}5$ m is filled with hot liquid at a temperature of $70\backslash$deg C$.$ The outside temperature is $20\backslash$deg C$.$ The overall heat transfer coefficient is $25.$ Calculate the surface area of the vessel and thus the heat flow rate from the hot liquid to the surroundings.

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