Safety Sealing a Jar of Smoke

Let's make a fresh jar of smoke. The problem with old jars is their safety buttons are popped up. Everyone can tell they've been opened. But you can reverse this by sparking up some combustion. Dump the flame in the jar, and the flame will turn oxygen into other gases.

But the total number of molecules in the jar will drop because when air molecules warm up and speed up, fewer fit in the same space. But they'll lose that fast bumper car energy when the flame goes out after we put the lid back on. Now, as they slow down, their smaller numbers will mean less pressure pushing the lid up and more pressure from the outside pushing down.

The safety button is back down, crushed by the superior pressure outside. Also, the jar is just as hard to open now as when it was brand new. Of course, I'm pretending to struggle here. I wanted to show you guys what it would look like if a normal person tried to open this jar.

Like, my actual strength would just rip the metal lid. So, I'm going to use a towel to protect the lid from myself. There you go, just like a brand new jar.