Aspiring engineer, 18, killed after homemade bottle rocket explodes
One of Maddosbrer's used to live just a few miles from Thousand Oaks. The article is a bit confusing, but it seems the explosion was not just a pressure explosion, but a detonation. How sealed propane bottle could have detonated is unknown. Propane, like most fuels, but unlike most explosives, needs oxygen, in addition to an ignition source/spark to explode. The propane bottle should not have oxygen inside which would allow the explosion to take place.
Anyway, a real tragedy, my thoughts are with his, and his friend's family, and friends.