A brass boiler has a base area of 0.15 m2 and thickness 1.0 cm. It bolls water at the rate of 6.0 kg/min when placed on a gas stove. Estimate the temperature of the part of the flame in contact with the boiler. Thermal conductivity of brass = 109 J *-1m-1K-1 ; Heat of vaporisation of water = 2256 × 103 J kg-1.
