You can blow out the candle with your mouth and analyze the reason for it

The most critical one:

If you blow it in one breath, if you blow a little bit, then it is obvious that you can see that the candle flame is off, and this is because the wax gas makes you blow that side.

If you blow too hard, blow the whole wax away at once. Then there will be no more evaporation of the wax gas needed for the next combustion. And it perished.

As for carbon dioxide in the population, it doesn't make much difference.

There is not much difference between being blown out by the wind and being blown out by the mouth.

As for the low temperature of the gases in the population. Then you can think that if you blow it with a high-temperature but non-flammable gas, you can easily blow it out. It's not much different either.

PS: The flame itself is in a plasma state, and the flame produced by combustion is generally a gas. Like the combustion of coal, it is also a flame produced by the gas in the coal. The burning of pure charcoal is without flame, only red. At this time, you can't blow it out.

The concentration of carbon dioxide exhaled by a person is very low and has little effect on candle burning.

It is the strong air flow that causes the flame to deviate from the candle core, and the air flow lowers the temperature of the candle core, and the combustion cannot continue.

The maximum amount of gas blown out by a person is only a degree, which is of course lower than the ignition point.

There are two ways to extinguish an object: 1. Lower its temperature below the ignition point 2: Isolate it from combustible gas The temperature of the outer flame of the candle is the highest, when eating, the wind blows the flame to the side, the flame is oblique, the center of the flame is the inner flame, leaking outside (the temperature of the inner flame is the lowest), the wind speed flow is easy to take away, the heat drops below the ignition point, and the exhaled gas contains a lot of carbon dioxide.

Carbon dioxide does not support combustion

The strong air flow causes the flame to deviate from the center of the candle, and the air flow temperature is only 36-40 degrees.

The temperature is lowered below the ignition point with the blown gas. There is also exhaled air that contains a lot of carbon dioxide. Carbon dioxide does not support combustion and is not combustible.

Bring its temperature below the ignition point.

Blowing out the candle is to lower the temperature, and the air flow coming out of the mouth causes the temperature around the flame to decrease rapidly until it is below the ignition point, and it is naturally extinguished.

Air convection causes heat loss and also lowers air pressure. When the mouth blows against the candle flame, the air flow will take away the heat around the candle flame and at the same time cause the air pressure in the air flow belt to drop sharply, and the candle flame will naturally go out because of the lack of temperature and oxygen. The candle flame is the capillary action of the wick to heat and volatilize the solid wax into a gaseous state and then burn.

The basic principle of fire extinguishing: According to the basic conditions of combustion, any combustible material must have the necessary and sufficient conditions for combustion to produce combustion or continuous combustion. Therefore, after a fire has occurred, extinguishing the fire is the process of destroying the combustion conditions and terminating the combustion reaction.

When the mouth blows out the candle, it blows away the heat of the candle flame, which lowers the temperature of the candle, causing the temperature of the combustible material to drop below its ignition point, so the candle goes out

There are two possibilities, 1] what people blow out is carbon dioxide, and the carbon dioxide blows down the flame, and the wick lacks oxygen and stops burning.

2] The gas blown out by the person takes away a lot of heat from the wick, which reduces the temperature of the wick. The flame is extinguished when the temperature is lower than the minimum temperature at which it burns.

But the second is more important, because it is not only the gas blown out by man that can extinguish the flame, but also the wind [the flowing air, in which the concentration of oxygen is much greater than carbon dioxide] can extinguish the flame. The wind blows the flame and has two effects, one is to take away a lot of heat, and when the temperature is lower than the minimum temperature of combustion, the flame is extinguished, and the other is to promote the convection of oxygen and carbon dioxide, which is the continuous arrival of oxygen, and the carbon dioxide is taken away, making the fire burn more vigorously [so the fire on the grassland will spread rapidly with the wind]. The end result depends on which effect dominates.

In the same way, blowing may make the fire burn more vigorously.

Option B because when the candle is blown, the air is flowing rapidly, and in the process of air flowing, the air pressure in the area decreases, so that the oxygen density in the area decreases, so that the fire does not support the combustion

Note: A and D are not possible

Eliminate combustibles, combustibles are candles, there is no elimination

As long as the ignition point is physical, it cannot be changed casually.

Most likely it is b and c, but when blowing out the candle, we can see that when blowing out the candle, the flame swings in the direction of our blowing, what is the reason?

Because it is a combustible gas, the direction of the process, we should have done a similar experiment, make a bridge with white paper, we blow air in the bridge hole, and then the white paper will be concave downward, indicating that the air pressure in the bridge hole is low, so that the paper is downward

In the same way, when blowing and starving, the air pressure on the flame is low, the air is gone, and the air (oxygen) decreases, causing the flame to be extinguished

Wood, coal, candles they have different ignition points, why back to the phenomenon you said it is very important. The reason for blowing the fire is that the air flow does not reduce the temperature of the flame below its own ignition point, but increases the oxygen flow on the surface, and the oxygen fuels the fire. The candle flame is small, and when it is blown, the air flow is fast and there is sufficient oxygen supply, but the burning must meet two conditions:

First, to reach the ignition point, and second, to have an accelerant. The rapid movement of the air will lower the temperature of the fire below the ignition point, and the flow will also reduce the surrounding air pressure, and the candle will be extinguished. If you change to a very large candle, you won't be able to blow it out, because it can't make the surrounding temperature drop below the ignition point.

Let the fire be as big as the flame of the candle, blow it with a stream of air of the same size, and see which one goes out first, depending on their ignition.

Because fire needs wind to burn, and candles are only made of wax, its fire is very small, and the wind blows only to extinguish, not to flourish.

The wind fuels the fire, and the candle flame is too small.

The conditions under which an object burns in the air.

1. Have sufficient oxygen.

2. The temperature reaches the ignition point of the object.

While the wind brings plenty of oxygen, it also takes away a certain amount of heat.

The flame of the candle is small, and in the circulating air, the heat dissipation is already large. In addition, the wind takes away some of the heat. The heat generated by the burning of the candle can no longer support the continuation of the reaction, and it naturally goes out.