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.
Many broken collarbones heal on their own. If you don't need surgery, you will use a sling to keep your arm and shoulder from moving while the bone heals. An adult wears a sling for a few days or up to a week. A child may need one for 3 to 4 weeks. You can begin simple exercises immediately and move on to strengthening exercises when they don't cause pain.