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Here's why crack your knuckle makes a popping noise



Do you often pop your knuckles? According to a new report, scientists may have finally figured out why the usual habit produces the characteristic bang.

Researchers from institutions in the United States and Europe have recently conducted a study published in Scientific Reports to study the crackling sound when adjusting its joints

"When we crack our knuckles, we actually pull ours Joints apart, and when we do that, the pressure drops. Blisters appear in the fluid that lubricates the joint – the synovial fluid, "said lead author Abdul Barakat of the BBC. "During cracking, there are pressure fluctuations in the joint that cause the size of the bubbles to swell extremely rapidly, and this leads to a noise that we associate with ankle cracking."

A previous study from the 1

970s concluded that the collapse of the bubbles caused cracking. However, the latest research shows that the bubble is still present and the pressure of a partial collapse is sufficient to produce sound.

Using a mathematical model that matched the size of the bubbles to those that made the noise, they could accurately predict that the acoustic wave generated by the pressure of the bubble would collapse.

"The model also shows that only a partial collapse of the bubble is required to reproduce the experimentally observed acoustic spectra, so that bubbles remain after the generation of sound, as reported in recent experiments," the authors write the study.

Scientists now hope to continue their investigations to simulate the initial, final, and long-term behavior of bubbles to better support their results.


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