👂What is that “crack” or “popping” sound? The sound made during an adjustment is called a 𝙘𝙖𝙫𝙞𝙩𝙖𝙩𝙞𝙤𝙣, a release of nitrogen gas from the joint space. When synovial joints are stretched or separated (as occurs with adjustments), a temporary vacuum (negative pressure) is created within the joint capsule. During this negative pressure, gasses like nitrogen, oxygen and carbon dioxide are rapidly released into the vacuum, resulting in the “popping” sound. Every adjustment has a purpose — r