Â­. Â­Dry ice is frozen carbon dioxide. A block of dry ice has a surface temperature of -109.3 degrees Fahrenheit (-78.5 degrees C). Dry ice also has the very nice feature of sublimation -- as it breaks down, it turns directly into carbon dioxide gas rather than a liquid.
The time for a broken collarbone to fully heal depends on the severity of the injury. In children, complete healing may take as little as three to six weeks. In adults, six to 16 weeks or more are often necessary for a collarbone to heal solidly.
Fortunately, most collarbone fractures are minor and will heal with rest, ice and pain relievers. But even then, healing can mean six to 12 weeks or more of time away from competition. The healing process for a collarbone (or any) fracture occurs in four consecutive stages: inflammation, soft callus formation, hard-callus formation and bone remodeling. That said, here are some tips to speed recovery.