On Tuesday, June 28, 2016 at 9:06:39 PM UTC-5, wrote:
On Tue, 28 Jun 2016 18:33:26 -0700 (PDT), bob_villain
wrote:


Aerosol cans, at least the butane ones, are designed to blow out a seam
in a controlled fashion, not just blow up.

CO2 is almost universally used now...unless you're talking about the fuel itself. WD-40 was a great thing for starting small engines...when it was pressurized with propane!

There are plenty that shoot fire when you hold a lighter in front of
them.

I understand your point, but propellants have changed...if they worked more efficiently...they should have stayed with the flammable gases.