I’ve always been a little embarrassed to ask, but when I have, say, a propane torch, how come the flame doesn’t go back through the line and blow up the can?
In: Engineering
your direct question has been answered.
Another question is “how do gas lines not explode”, there are time when air get into gas lines to houses, and even more-so, the gas burners on your hob are fed with a fuel-air mix that is combustable – AND YET the flame never travels up the pipe to the source of the air/fuel mix.
Fire requires three things, Fuel, Air and Heat
Butane requires 400 degrees to light, in a flame this is trivial to get, but to remove this heat all you need is a small orifice made of heat sinking material (like metal). The flame cannot go “up the pipe” because the nozzle and pipe is made from material that will rob the flame of the heat it requires to stay alight
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