Why do candles burn with cores? Why do candles burn

Whether it is a candle or an oil lamp, there must be a wick, the flame burns at the upper end of the wick, the wick is a thick enough thread of cotton or other porous materials, relying on capillary action to continuously put the lamp oil (kerosene or vegetable oil) ** into the flame. The temperature of the flame makes the lamp oil and gas, and if you pay attention to it, you can see that there is a darker part in the ** of the flame, which is the oil and gas that has been vaporized but is still to be burned. Combustion is the rapid oxidation of fuel, and three conditions must be met:

fuel, oxygen, and a sufficiently high temperature. The fuel in the flame of a candle or oil lamp is the vaporized lamp oil, and the oxygen in the air outside the flame must diffuse into the flame before it has a chance to contact and mix with oil and gas and burn. The part of the flame that glows is the oil and gas that is burning.

The main components of wax, kerosene and vegetable oil are carbon and hydrogen, so the products of reaction with oxygen, i.e. combustion, must be carbon dioxide and water vapor. In order to maintain a stable flame, in addition to the smooth fuel through the wick, the oxygen in the air should be smoothly diffused into the flame, and the carbon dioxide and water vapor generated by combustion should be smoothly diffused to the outside of the flame, and away from the vicinity of the flame, so as not to affect the inward diffusion of oxygen. Therefore, in order to maintain a stable flame, there must be proper ventilation, but the ventilation should not be too strong, otherwise the unburned oil and gas will be blown away, or the temperature will be lowered too low, and the flame will be extinguished.

1. Use the capillary phenomenon of the core (to make the wax oil rise).

2. The ignition point of the utilization core is lower than that of wax. (The core can be burned first, and the wax can be burned after the temperature is raised).

It can't burn without a core.

The core plays a major role.

Mostly cotton.

Because it is flammable. Can't do without cores.

No, that's not the case.

<> principle of candle burning is zen burning:

1. The burning of the candle is actually the steam of wax burning;

2. The composition of wax collapse dust is some alkanes with relatively low liquefaction vaporization temperature;

3. The temperature of the flame of the wick can melt or vaporize the wax and accelerate the evaporation of the liquid wax;

4. The wax vapor rises with the air flow, and then these vapors enter the combustion area with a higher temperature, reach the ignition point, and burn.

A candle is an everyday lighting tool made of paraffin wax that burns to give light. In literary and artistic works, candles have symbolic meanings of sacrifice and dedication. Burning oneself and illuminating others, even if they turn into ashes, they must emit their own light, which refers to a person with great dedication, who is willing to sacrifice himself and think about others, which is similar to the meaning of spring silkworms.

When the candle is burned, it produces: carbon dioxide and water.

Verification: Light the candle, cover a cold and dry beaker over the candle for 5 minutes, quickly invert the beaker, and find that the inner wall of the beaker becomes blurred and water droplets are generated, indicating that the candle burns to produce water.

A small amount of clarified lime water was added to the beaker and shaken, and it was observed that the clarified lime water became turbid, indicating that the candle burned to produce carbon dioxide.

Candles, a tool for daily lighting, are mainly made of paraffin wax, and in ancient times, were usually made from animal fat. Combustible glows. In addition, candles are very versatile:

It is also used in birthday banquets, religious festivals, collective mourning, ceremonies and other activities. In literary and artistic works, candles have symbolic meanings of sacrifice and dedication.

Categories: Education, Science, >> Science & Technology.

Analysis: In fact, paraffin wax itself can burn, but its ignition point is higher than the melting point (strictly speaking, paraffin wax is amorphous and has no melting point), so it is necessary to provide a large amount of heat to melt the wax before it can burn.

After adding the wick, only a small amount of paraffin wax on the wick needs to be melted, so it is easy to ignite. The heat generated after combustion then continuously melts the surrounding paraffin, allowing the burning to continue.

Before there was no electricity, I used paraffin wax for lighting, and put paraffin wax in an aluminum lunch box, just a wick with a cloth, because the wick was too thick, and finally the whole box of paraffin wax was burned!

The reason why the wax is not ignited when it exists alone is because it does not allow the process of burning and drying, and it also includes a process of wax oiling, if it is not vaporized, the liquid wax oil will extinguish the fire! In the process of burning a candle or oil lamp, the fuel is sent from the oil tank along the wick up to the flame burning part by capillary action, and when the fuel reaches the upper end, it begins to vaporize. The capillary force brings the fuel to a combustible place where it can be burned, and it is stored there.