In the past numerous New Year, the most annoying thing is probably the crackling sound of firecrackers, while another may also need something to ignite won all love, that is, fireworks, fireworks in the night sky when the gorgeous bloom, everyone will look askance. In "Love Apartments" in that when Lu son Joe describes fireworks That imaginary wedding in full bloom to Mika, Mika was moved to tears again and again, then fireworks why so beautiful it?
Often cooking friends may have had this experience, when cooking pot, add salt to food, accidentally hands crooked, sprinkle salt pan to the outside by the fire ignited, then the salt particles salt will instantly appear a bright yellow small flames, fireworks, too, but it is not lit salt, but some other metal or metal salt. For this metal or metal compound is ignited when it will emit different colors of fire phenomenon, a professional term to define it, called "flame reaction." Causes the flame reaction is due to the different atomic structure of these metals, we all know by atomic nuclei and electrons, usually the energy of these electrons is not high, they stay in their own law-abiding change a place to stay, professional statement is "in the electronic ground state", which is the most basic energy state, and when they encountered fire metal atoms, the outermost electron absorbs a lot of energy, excess energy at this time they are like children in general, left ground state transition to the higher energy of the place, known as "excited state", but these small electronic still want to return to the ground state of desire, how it absorbed the energy to do? He had released in the form of electromagnetic waves out. Different atoms have different electronic energy of the ground state and excited state from an excited state to the ground state energy released is different, which leads to a different wavelength of electromagnetic waves that they produce such different wavelengths of electromagnetic waves behave in life, that is, the different colors of light.
Starring component of salt is sodium chloride, sodium flame reaction is bright yellow, in addition to sodium, calcium flame reaction is brick red, green and yellow elements barium, copper because of impurities can be different from the shallow blue to blue-green, purple potassium, zinc is blue-green. There are a lot of elements has its own unique color, when we put these elements in different proportions put fireworks in the sky will be lit after blooming flowers of different colors.
In addition to the flame reaction is used in fireworks than in many other places of great use, for example, which is a commonly used method of identifying material composition of the chemical, also in road, airport terminals, ports, railway stations, squares, etc. local, often use a lamp called sodium lamp, power and it will release a bright yellow light, though not by sodium fire to provide energy to a sodium atom, but after the power, under the influence of an electric field, the outermost layer of sodium atoms electronic or absorb power transition from the ground state to the excited state, and then jump back to the ground state, emit light at the same time, it would be another application of the flame reaction. (Author: Single Shaojie)
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