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~Icon~ ~by~ ~@Double_A@discuss.tchncs.de~
Corn Syrup.
Cars Lithium ion batteries
Knives
Oxygen is highly flammable
Pure oxygen does not burn on its own. It needs a fuel.
+Humans
There you go
I wouldn't call compressed air extremely dangerous, but more than you'd think.
It can hurt you in a lot of ways and it's often played with like a toy. Like blowing air in somebody's face, don't do that, think of it like coming at them with a handheld drill. Treat an air compressor like any kind of power tool, not exactly dangerous but can hurt you.
Hm, interesting question. Dangerous in which sense?
A kitchen knife can easily kill a person. A match might burn down a house. Everything that produces CO2 or other greenhouse gases is extremely dangerous for the whole world in the long term.