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.
After 10 to 14 days of wearing the sling, the fracture will stabilize and have new bone growth at the injury site. Your child may feel a bump on the collarbone. This is normal; it means that the fracture has healed.The bump will get smaller over the next year, but it may not disappear completely.fter 10 to 14 days of wearing the sling, the fracture will stabilize and have new bone growth at the injury site. Your child may feel a bump on the collarbone. This is normal; it means that the fracture has healed. The bump will get smaller over the next year, but it may not disappear completely.