An education isn’t how much you have committed to memory, or even how much you know. It’s being able to differentiate between what you do know and what you don’t – Anatole France
(Educatia nu reprezinta ce ai putut sa memorezi, si nici macar cat de multe stii. Educatia iti permite sa diferentiezi cunoasterea de necunoastere.)

marți, 2 octombrie 2012

What Makes a Candle Flame?

  • DOI: 10.1002/chemv.201000145
  • Author: ChemViews
  • Published Date: 06 December 2011
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
thumbnail image: What Makes a Candle Flame?

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Combustion Processes

  1. Melting of the fuel
  2. Transport of the fuel by the capillary action of the wick
  3. Conversion of the liquid fuel into gas
  4. Thermal decomposition (pyrolysis) of the fuel
  5. Oxidation of the pyrolysis products
Solid carbon particles, soot, form at about 1,000 °C. These are excellent blackbody radiators of colors in the yellow to red spectrum. The typical yellow color of a candle flame or wood fire is therefore produced primarily by the hot soot. The mixing of the fuel and the O2 is the slowest part of the combustion process and, therefore, the rate determining step.

See more on: http://www.chemistryviews.org/details/ezine/1393243/What_Makes_a_Candle_Flame.html
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