The speed at which such a combustion wave travels through a fuel mixture is called the buring velocity of the mixture. The burning velocity of a gas such as methane quietly burning in air is only about one foot per second. By comparison, the burning velocity of more reactive combinations such as the rocket fuels and hydrogen can be hundreds of feet per second. If the fuel flows at the same speed as the combustion wave, the result is a stationary flame, like the one in your kitchen gas burner. In the kitchen burner, a jet of gas mixed with air flow mixture flowing from the opening in the head of the burner. If the velocity of the fuel mixture flowing from the openings is greater than its burning velocity ,the flame blows out 해석해주시면 ㄳㄳ