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
The contents of the propane can are under pressure. Gas wants to move from high pressure to low pressure. When you open the valve, gas comes out, because it is pushing against the back of the valve.
The gas can’t burn inside of the hose because it has no oxygen (the hose is full of gas and there’s no room for oxygen,) and because the gas is pressurized, gas is pushing to get out of the hose where it can mix with air and undergo the combustion reaction.
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