Why doesn’t the flame from a propane torch travel back to the can and blow it up?

Question

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

Answer 1

The gas inside the tank moves to a lower pressure area from a higher pressure area, and a low pressure area wouldnt be able to move into a higher pressure area since there is high pressure gas coming out, theres also no oxygen for it to light.