In a petrochemical industry seminar, a guy told about invisible fire (only heat can be felt) he said it’s very dangerous and has a lot of potential for burning. What chemic causes invisible fire? if fire is defined as the chemical reaction that produces heat and light, how is it invisible?
In: Chemistry
The chemical reaction if a fire do not produce light it produce hot material and some will glow in visible light bit not others. Fire or more exactly combustion is a high temperature chemical reaction with a oxidizer, most often oxygen, that is rapid and release energy. It will heat stuff up but by itsefe not produce light. What you mostly see in common fires are hot glowing soot particles.
A fire that burn cleaner that do not produce lots of sooth will be less visible. Look at [https://youtu.be/lPdZmCbbjtM?t=169](https://youtu.be/lPdZmCbbjtM?t=169) where a bunsen burner is adjusted to get the right amount of oxygen and the flame change from bright orange to quite had to see blue. If there is more oxygen the combustion will be more complete and less soot that glow is produced. What is produced is just water and carbon dioxide and at the temperature is reaches it will not emmit visible light to a very high degree.
Look at methanol that burn and do not produce a lot of sooth, the flame very had to see out in daylight [https://www.youtube.com/watch?v=1ZEEuCHdWFA](https://www.youtube.com/watch?v=1ZEEuCHdWFA)
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