A mixture of ethyne and pure oxygen is used for welding instead of using a mixture of ethyne and air. Why?
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Ethyne est un composé carboné non saturé. Il brûle dans l'air avec une flamme suie. C’est une combustion incomplète car l’oxygène disponible dans l’air ne suffit pas à brûler complètement le carbone. Par conséquent, pour une combustion complète, de l'oxygène pur est nécessaire, ce qui brûle le carbone et l'hydrogène en produisant une flamme très chaude et propre, propice au soudage. Il n'est pas possible de générer une température aussi élevée sans oxygène pur.
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A flame using pure oxygen can reach a higher temperature.
The energy liberated in the oxidation is first used to heat the immediate vicinity of the reaction products. If the oxygen is diluted with 80% nitrogen, all of that nitrogen must be heated as well, and this results in a lower temperature than the same reaction in pure oxygen.
Air also has CO2 which does not support combustion
The energy liberated in the oxidation is first used to heat the immediate vicinity of the reaction products. If the oxygen is diluted with 80% nitrogen, all of that nitrogen must be heated as well, and this results in a lower temperature than the same reaction in pure oxygen.
Air also has CO2 which does not support combustion
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