How to tell fortune with matches and candles _ Matches and candles
? I think the tradition of China is the most exquisite and meaningful! For example, on birthdays, we all eat a bowl of longevity noodles. This name makes people feel festive. Compared with western cakes, we should light a candle when eating cakes. When a candle is lit, it will be blown out. This is very unlucky in China tradition. Blow out the lights and pull out the wax to mean the end!
When you blow out the candle, you can see a wisp of white smoke. Igniting this wisp of white smoke with a burning match can rekindle the candle, so it can be proved that white smoke is a solid fine particle produced by the condensation of paraffin vapor.
When a candle burns, the products of combustion are carbon dioxide and water. Chemical expression: C25H52+O2→ (ignite) CO2+H2O. The combustion phenomenon in oxygen cylinder is that the flame is bright and emits white light, releasing heat, and water mist appears on the bottle wall.
Principle:
The candle burning we see is not the burning of paraffin solid, but the ignition device ignites the cotton core, and the heat released makes the paraffin solid melt and vaporize again, generating paraffin vapor, which is flammable.
When the candle is lit, the initial flame is very small and gradually becomes larger. The flame is divided into three layers (outer flame, inner flame and flame core). The core of the flame is mainly the candle steam with the lowest temperature; The internal flame paraffin is not fully burned, the temperature is higher than the flame center, and it contains carbon particles.
The outer flame is in full contact with the air, and the flame is the brightest, the combustion is full and the temperature is the highest. Therefore, when the matchstick is quickly laid flat in the flame and taken out after about 1 second, the part of the matchstick that contacts the external flame turns black first.