The student, from the Aviation College of Sweden (ACS), was wounded while experimenting with a home made bomb in the kitchen of a hotel inhabited by students from the school.
The student has been taken to hospital with serious burns to both his arms. His hearing was also damaged in the blast.
Earlier reports that three other people had also suffered injuries when the black powder bomb exploded later proved incorrect.
Aviation College of Sweden is an upper level high school focusing on the training of aircraft mechanics, technicians and airline pilots.