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.
1 The clavicle is the collarbone. 2  The fracture will begin to heal after 10 to 14 days. 3  You child will need to avoid high-impact activities for a minimum of 4 to 6 weeks after he stops wearing the sling.he sling helps to keep your child's arm and collarbone still so the bone can heal. Your child may need to wear the sling for about 2 to 3 weeks.