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.
Fractures - Broken Bones. 1  Simple Fractures: A fractured bone generally takes at least six weeks to heal. 2  Fractured Finger or Toe: These fractures typically heal in three to five weeks. 3  Fractured Clavicle (collarbone): This may take five to ten weeks to heal.