this post was submitted on 14 Apr 2025
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This is inaccurate. Graphite is not flammable. It forms small particles that, mixed with air, could combust in a dust explosion, just like flour.
I'm probably just being dense but what's the difference between being flammable and being susceptible to combustion?
In technical safety terms, combustibles are harder to ignite than flammables. So diesel and olive oil are combustibles, for example, because neither of them give off enough ignitable vapour at room temperature. Ethanol does, so it gets classified as flammable, and you need to store and handle it more carefully than diesel. Then there's really horrible stuff like triethylborane which will catch fire upon meeting oxygen even at temperatures well below the freezing point of water
Of course in casual usage they mean the same thing
You're not dense for asking a question. Without asking questions, it's Impossible to learn.
The flash point is different. The flash point is the temperature that is necessary to create enough vapor for the substance to ignite.
Flammable material has a low flash point, which means it catches on fire easily. Think gasoline. Combustibles need a higher initial temperature, but eventually they will burn and sustain the burning until running out. Think wood.
Makes perfect sense, thank you
You misgendered round spicy flames
They’re referring to the relationship between surface area and combustion. Talc, for example, melts but does not burn. Talc powder can ignite if blown over an open flame.
My first thought was: "I must try this". I need to read my house insurance policy first.
Curiosity got the better of me when I waved an alcohol wipe over an open flame. There's still a dark mark on the office carpet tile from where I had to stamp it out.
Let it be someone else’s carpet. Or in this case, driveway.
https://youtu.be/Ce_uT1TXYr0
Skip to 3:10 for the action.
Please invest in a fire blanket and keep it near by when you do stupid things with fire.
Signed, a fellow fire bug
Mine paid for itself the first time a flame got out of control while I was having some fun. No lasting burns to human or objects in my office lol.
Keep away from dust explosions, they are very uncontrollable because they ignite very fast and produce a lot of heat. It's technically not an explosion, but it definitely is an easy way to burn your house down.
Mythbusters did this with coffee whitener as I recall. Impressive.
This has also happened to sawmills and flour mills, under less controlled circumstances.
Let us just note that this would be impossible when using it to write something.
That.. are you kidding? Can't you read?
OP was wrong, it wasn't pens. Youre wrong, flammability wasn't the problem.
Jesus christ
I don’t know where you got any of this, your comment makes the least sense of anyone in this post, and some of these people are actually wrong
Wood.
Wood is also combustible. You need a lot of heat to make wood burn. Hold a lighter to your pencil, it will not instantly catch fire, do the same with paper and you need a water bucket nearby.
Sharpen the pencil and create a bunch of tiny shavings then put them in a pure O² environment. They'll light up real fast.
Tbe Apollo 1 fire spread so quickly because in a pure O² environment fucking velcro was super flammable.
Yeah, try lighting your pencil on fire in a 100% O2 environment. It's not the pencil being flammable that was dangerous, it was the pure oxygen atmosphere making the pencil extremely flammable to the point where a small spark from static electricity could cause it to almost instantly immolate, that made it dangerous.