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.
Scars around the shoulder can be a cause of concern, particularly for ladies wearing thin strap tops and swimwear. Generally surgical wounds are made in the natural skin lines, known as Langer's lines, so scars should heal very well. It normally does take up to one year for a scar to disappear, but this can be improved with Silicone Gel application.