When attempting to light both gases in a torch at once, more oxygen flowing than the amount that can pass through the tip can cause backfire. When more oxygen is flowing than can pass through the tip of a torch, the excess oxygen builds up in the flame chamber.
This increase in oxygen will makes the flame hotter, which can cause the fuel to ignite more quickly, resulting in a backfire. If the gas mixture is not right, the extra oxygen can also cause the fuel to burn too quickly, resulting in a backfire. It can cause the fuel to ignite too quickly and resulting in an explosion.
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