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.
A collarbone break or fracture is a common injury. The collarbone is also known as the clavicle and is the bone that connects your arm to your body. Most broken collarbones are treated non-surgically by immobilizing your arm in a sling for several weeks. If your collarbone is displaced, or out or normal alignment, surgery is required.