A combustion microbomb is presented, whose internal volume is about 4 mL: t
he instructions of utilization are mentioned and so the results of calibrat
ion experiments with benzoic acid and of combustion experiments of urea and
salicylic acid (Delta H-f(o) = -328.515+/-1.97 kJ.mol(-1) for urea and Del
ta H-f(o) = -593.594+/-0.91 kJ.mol(-1) for salicylic acid). Use has been ma
de by a Tian-Calvet type calorimeter with two cells.