I suppose? Most of the standard cylinders are fairly secure. A lot of the time I spent during my job there was preparing cylinders for testing, to assure that

I suppose? Most of the standard cylinders are fairly secure. A lot of the time I spent during my job there was preparing cylinders for testing, to assure that they were pressure-secure and airtight. Neat stuff, and a TON of practical physics went into everyday things there. :)