Montreal, Canada/canada320

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Case D. This is a differential air calorimeter, where two flasks are connected by a manometer. A known mass of radium is inserted in the right flask and a resistance wire in the left flask. The heat was adjusted in the resistance wire on the left so that xylene in the manometer balanced by equally heated (and thus equally expanded) air in both flasks. The amount of heat generated by the radium was calculated to be 110 gram-calories/hour, enormously greater than that generated in chemical reactions.