Sanitizers are made of alohol, so the process of combustion takes place completely. This process is also called complete combustion. But the wood undergoes incomplete combustion. The remain of the ash tells you if an object has undergone complete combuation or not. So the complete combustion makes the fire appear blue. And u can also observe this phonomenon in ur kitchen gas stove..

Sanitizers typically contain isopropyl alcohol. A higher temperature “clean” burning product, which is why it has a blue flame. Wood has additional combustible components that don’t burn as cleanly. Wood also burns at a lower temperature than iso alcohol..

Swan bands are a characteristic of the spectra of carbon stars, comets and of burning hydrocarbon fuels.[1][2] They are named for the Scottish physicist William Swan, who first studied the spectral analysis of radical diatomic carbon (C2) in 1856.[3]



Spectrum of the blue flame from a butane torch showing excited molecular radical band emission and Swan bands.

Swan bands consist of several sequences of vibrational bands scattered throughout the visible spectrum.[



When enough air is supplied, no soot is produced and the flame becomes blue. (Most of this blue had previously been obscured by the bright yellow emissions.) The spectrum of a premixed (complete combustion) butane flame on the right shows that the blue color arises specifically due to emission of excited molecular radicals in the flame, which emit most of their light well below ≈565 nanometers in the blue and green regions of the visible spectrum.


The colder part of a diffusion (incomplete combustion) flame will be red, transitioning to orange, yellow, and white as the temperature increases as evidenced by changes in the black-body radiation spectrum. For a given flame's region, the closer to white on this scale, the hotter that section of the flame is. The transitions are often apparent in fires, in which the color emitted closest to the fuel is white, with an orange section above it, and reddish flames the highest of all.[5] A blue-colored flame only emerges when the amount of soot decreases and the blue emissions from excited molecular radicals become dominant, though the blue can often be seen near the base of candles where airborne soot is less concentrated.[6]

00:00introduction
00:52Two case study
01:11Why sanitizer flame blue?
02:14Why wood flame yellow?
02:50Science behind Everyday life
03:00Alkali metal flame
03:26#pawrihorihai failed
03:37Please consider subscription


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