Answer:
Hydrogen burns with a pale blue flame that is almost invisible during daylight hours, so fires are almost impossible to see with the naked eye. Hydrogen fires have low radiant heat, so you can't sense the presence of a flame until you are very close to it (or even in it).
When an alcohol-based hand sanitizer gel can catch fire, it will produce a translucent blue flame. This is due to the flammable alcohol in the gel. ... Due to the static electricity, the vapor from the hand sanitizer ignited with an almost invisible flame on both hands.
Explanation:
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