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Why is fire orange, yellow or blue?

Why is fire orange, yellow or blue?
Abi Bonnar-Hewitson from Stockton on Tees (Aged 5-14)

Why is fire yellow?
D.James from Greater London (age 25-34)

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2 Responses

  1. The yellow/orange colour is usually from the glowing of thousands of tiny, invisible soot particles in the flame. This is the case with a low-temperature flame such as a candle or a bunsen burner with the air valve closed. A yellow colour is also produced when sodium atoms, present in most living things, are excited (this is the colour of sodium street lamps). You can get this colour by sprinkling salt (sodium chloride) into a flame. Incidentally, firework manufacturers add metal salts to get a wider range of flame colours — for example, barium gives green, and strontium gives red. Normal flames are unlikely to contain these elements.

    The blue colour of flames arises usually when you have hotter flames. The higher temperature provides more energy to break down the soot particles into small organic molecules which now emit blue light.

  2. but y r they those colours??? y cant they burn differant?? so y r hot flames blue, instead or say pink??

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