After the fireworks are lit, a chemical reaction similar to the above causes an explosion, and most of the energy released during the explosion is converted into light energy. Adding some luminescent coloring agents in the process of making fireworks can make fireworks emit colorful colors.
Fireworks are made of this property of metal.
Fireworks makers skillfully arrange and decide the order of burning. In this way, after the fireworks are detonated, bright and colorful patterns can bloom in the dark sky, which is often called flame reaction in middle schools.
Different kinds of metal compounds will emit different colors of light when burning.
For example, sodium chloride and sodium sulfate are sodium compounds, which will emit a golden flame when burned. Similarly, when calcium nitrate and calcium carbonate burn, they will emit a brick-red flame.
In chemistry, the above results are often used to test the metals contained in substances. This type of experiment is called flame test.
Extended data
Discharge hazard
1, the noise pollution is serious when it is discharged, which has an impact on both cities and villages;
2. Generally, fireworks will release more air pollutants, such as SO2, NO, NO2 and dust, which will cause environmental problems such as acid rain. It is understood that fireworks will produce gases such as sulfur dioxide, nitric oxide and nitrogen dioxide. These poisonous and harmful gases are invisible "killers"
3. Fireworks and firecrackers not only bring embarrassment to urban sanitation, but also bring security risks. Because many people set off firecrackers everywhere, they had to be cleaned up by sanitation workers the next day. Once the flame is not extinguished, under the condition of long-term drought in the northern region, it is easy to ignite dry trees and grass and cause fires.
4, easy to cause fire.
With the strengthening of people's awareness of environmental protection, electronic fireworks have also appeared.
Electronic fireworks is actually a projector, the fuselage is hemispherical, at first glance it feels more like an astronomical telescope. Projected in a dark space by the above six high-brightness LED lenses. There is a big lens, four small lenses, and a lens that can rotate 180 degrees. All the lenses are protected by a transparent spherical cover. And the base has a row of operation buttons.
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