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As far as I know, it's just bubbles of Nitrogen gas. When you crack your knuckles, the bubble bursts into tiny bubbles, making a cracking noise. The gas is still there in the joints, but because it's in the form of many tiny bubbles, your knuckles don't crack. If you sit around for a while, those many bubbles reform back into a big bubble and you can crack your knuckles again.

Don't take my word for it though - I'm not an expert. I have read about it and this is what I remember off the top of my head.

Your recollection matches mine, which is at about the same level of knowledge as yours.

Yes, you can crack your knuckles by holding them out straight and pulling/stretching them.

Ask and the internet shall provide. Basically, nitrogen bubbles.

https://m.youtube.com/watch?v=n3IYmdy6d4Y

Vary nice, thanks for hookin me up to the watch! Still don’t understand where tha gasses go tho from the video I probably missed it

Ah. Add I understand it. The gas forms tiny bubbles. When you crack your knuckles they "burst" and the had disperses. It then takes time to create the little pockets again.