Why is it that when you "crack" your knockles, it makeds a sound?!

Question: or any other part of your body like your back and neck.

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Answers: or any other part of your body like your back and neck.

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Basically, the stress on the joint is pulling it apart slightly. The negative pressure on the lubricating fluid in the joint eventually makes it vaporise. That sudden vaporisation is what makes the noise.

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your pushing out oxygen in your fingers

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