I have an electric device which frequently gets very oily (it's a vaporizer for herbs). It came with a few individually packaged small "tissues" drenched in "isopropyl alcohol". I've used up them all now to clean the insides.
After each cleaning session, I wait a few minutes before I put in new herbs and heat it up again (to 365-420 degrees F). Every time, it feels scary, because "isopropyl alcohol" is said to be "extremely" flammable. I feel like it's going to explode every time, but it luckily never does. Since they shipped those with the product, and didn't mention a word about this in the "manual", I assume it's safe.
But how can it be safe? Is it not hot enough? Does it evaporate so quickly as to never actually be left in there when I heat it up?
I also bought a separate, very expensive bottle of what I assume is "high-quality" isopropyl alcohol and poured it into a glass container with a firm plastic lid, which I keep in a wardrobe. Luckily, it doesn't seem to evaporate into nothing, like used to happen with other alcohol which I previously attempted to store in the same container. After a couple of weeks, half of it had disappeared! That doesn't happen with "isopropyl" alcohol, apparently, but why doesn't it?
As you can hear, I wonder both how (in)flammable it really is, and what makes it not evaporate inside the box, but does evaporate very quickly (apparently) when not restricted by a closed container.