This calorimeter consists of two nested aluminum cans separated by a 1.7 cm thick styrofoam liner and a clear molded Polystyrene lid with a filler cap. A plastic insulator ring protects the styrofoam insulation against damage and liquid spills. The inner reservoir has a capacity of 150 mL. A thermometer stopper and an insulated stirrer are included. Due to the lid being Polystyrene, chemical reactions are not recommended. Includes activity guide.