![Here's what happens to your knuckles when you crack them Here's what happens to your knuckles when you crack them](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj2iXpKDyW5u8xbKwnzA7QDgHpiTx1qCZl221wuhUHnk2BEpG6K8eXWAfaRfJSb_mNEeDZXkV7MZx3bjZUT3VyDrbfXs5nzKnzPT0fBXIkD96SKMs9SUcbifXxaUHUJykx89YWEQU_8_I5H/s1600/Here's%2Bwhat%2Bhappens%2Bto%2Byour%2Bknuckles%2Bwhen%2Byou%2Bcrack%2Bthem.jpg)
There's a space in your joints filled with synovial fluid, a liquid that reduces the friction in your joints when you move. It contains gases (oxygen, nitrogen, and carbon dioxide).
When you pop a joint, you stretch out that space between the bones. That expanding space creates negative pressure, like a vacuum, that sucks in the synovial fluid. It forms bubbles, which then collapse, and that's what you hear.
![Here's what happens to your knuckles when you crack them Here's what happens to your knuckles when you crack them](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgR1YX1SvSTSE9Y_0eUthjAN-wSO_kzzY1AlNu6ie36ThX-Qln2Dper_NjS1m1P4uLrS76xWYvTEE7hzJCd7pwfE4fvnOn01vSMz9mtC9GTcOWnvzZH6amvEX33O0um1TQj4n0-KKDRtDGR/s1600/Here's%2Bwhat%2Bhappens%2Bto%2Byour%2Bknuckles%2Bwhen%2Byou%2Bcrack%2Bthem.jpg)
Source: Vox via ScienceDump
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