What are the experimental phenomena of igniting magnesium rods?

Magnesium is ignited in the air, giving off dazzling light (water mist) and white solid (white smoke); Magnesium is ignited in oxygen and burns violently, giving off dazzling white light and producing white solid (white smoke).

Magnesium has strong reducibility, can react with boiling water to release hydrogen, and can produce dazzling white light when burning. Magnesium does not react with fluoride, hydrofluoric acid and chromic acid, nor is it corroded by caustic alkali, but it is easily soluble in organic and inorganic acids.

Magnesium can be directly combined with nitrogen, sulfur and halogen, and organic chemicals including hydrocarbons, aldehydes, alcohols, phenols, amines, fats and most oils have little or no influence on magnesium. However, it reacts violently with halogenated hydrocarbons under anhydrous conditions (Grignard reagent is generated). Magnesium can react with carbon dioxide, so magnesium combustion can't be put out with a carbon dioxide fire extinguisher.

Magnesium can react with n? And o? Reaction, so when magnesium burns in the air, it burns violently, giving off dazzling white light, releasing heat and generating white solids. The change of vinegar is that bubbles come out quickly, float on the vinegar surface and gradually disappear. Some fireworks and flares contain magnesium powder, which makes use of the characteristic that magnesium can emit dazzling white light when it burns in the air.

Application:

Photographers should prepare a certain amount of flash powder in advance before taking pictures, and then manually light it while pressing the shutter in loud noise, flash and white smoke. Magnesium powder powder is not safe, so there are not a few photographers who were injured by explosion when mixed with powder. Photographers with curly hair and black smoke have become a common ridicule theme in comics.

But thanks to the strong light of magnesium powder, objects in the dark can also be imaged on the negative, and the faster shutter speed makes the instantaneous motion freeze on the film, which greatly expands the application field of photography. ?

With the development of electric power, emerging energy technologies have brought some changes to photographers who play with fire. The heat generated by the current passing through the fuse is used to ignite magnesium powder. This new product is called flash, which is the origin of the word "flash" today.

Photographers no longer have to worry about being caught by the fire. More importantly, they can realize the synchronization of flashing and shooting through electronic circuits, which greatly expands the application range of flash.