____ is the method of waste treament at very high temperature inside a furnace.
A piece of iron of mass 0.2 kg is kept inside a furnace, till it attains the temperature of the furnace. The hot piece of iron is then dropped into a calorimeter containing 0.24 kg of water at 20 °C. The mixture attains an equilibrium temperature of 60 °C. The temperature of the furnace is