By the miraculous grace of God, a crack allowed pressure to bleed & enabled our engine company to prevent thermal runaway. A BLEVE was the projected outcome, a firefighters worst nightmare - see the Kingman BLEVE - https://www.cityofkingman.gov/government/departments-a-h/fir...
It's ok to just treat it like a thing people say. When people say 'bless you' I don't explain to them that sneezing doesn't actually expel my soul from my body.
Slavery is not OK. Someone indentured for owing a debt can be compelled for a maximum of six years and goes free in the seventh, with no payment required from him.
My parents are retired fire-fighters. They had an American pygmy goat named Bleve. Those goats commonly have very rotund stomachs[1] that look like they are about to explode.
A BLEVE does not need oxygen to become an explosion. The explosion occurs with the rupture of a tank (that has been heated, increasing the internal pressure and thus increasing the boiling point of the liquid inside, so that it remains liquid). This causes a loss of rapid loss of pressure, which in turn rapidly decreases the boiling point of the liquid, thus causing a sizable part of the liquid to almost immediately boil and cause an expanding "cloud" of gas.
When this occurs, you have an explosion that can propel parts of a steel propane tank up to 1/2 mile (at least).
It doesn't need it but it makes it that much more destructive. Your propane example is such a case - as the hot cloud expands explosively it burns on contact with new oxygen and the heat serves to further perpetuate the process. An overheated tank of propane provides an illustration of the principle on which thermobaric warheads are based.
