How do fire breathing performers do their performance without the fire traveling backwards along the fluid toward their mouth?
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Fire breathers spray the fluid with a lot of force and only parting their lips tightly. This maximises the fluid velocity and also allows the fluid to become more of a spray.
The spray has a high surface area so ignites easily. That’s also why the flames are quite big.
The speed of the spray is however faster than the ignition “travel” so it doesn’t reach their face.
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