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Different flame color result from chemical additives

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Different flame color result from chemical additives

Author: Date :2019-08-02 Views: order
Generally ,most fires are the result of combustion -- a chemical reaction between a fuel and a compound of oxygen -- in most cases, molecular oxygen. As an exothermic reaction, the fire releases heat, but when combustion speeds up, flames begin dancing atop and within the burning substance with the flame’s colors depend on the amount of heat being released: hot flames are white and cool ones are red. As things heat up and combustion becomes more complete, flames turn from red to orange, yellow and blue. Flames often appear white when emitting a variety of colors at the same time, which accounts for the flame’s heat.
 
The color of a flame may be red, orange, blue, yellow, or white, and is dominated by blackbody radiation from soot and steam. When additional chemicals are added to the fuel burning, their atomic emission spectra can affect the frequencies of visible light radiation emitted - in other words, the flame appears in a different color dependent upon the chemical additives.
Different flame color result from chemical additives(图1)
flame colour
Li red
Na strong persistent yellow-orange
K lilac (pink)
Rb red (reddish-violet)
Cs blue-violet (see below)
Ca orange-red
Sr red
Ba pale green
Cu blue-green (often with white flashes)
Pb greyish-white

The colours in the table are just a guide. Almost everybody sees and describes colours differently. I have, for example, used the word "red" several times to describe colours which can be quite different from each other. Other people use words like "carmine" or "crimson" or "scarlet", but not everyone knows the differences between these words - particularly if their first language isn't English.


 
 
 
 
 
 
 
 
 
 

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