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.
It might take six to 12 weeks for a broken collarbone to heal. But that's just a rough estimate. People recover at different speeds. You are ready to return to your previous level of physical activity when: 1  You can move your arm and shoulder without any pain.t might take six to 12 weeks for a broken collarbone to heal. But that's just a rough estimate. People recover at different speeds. You are ready to return to your previous level of physical activity when: 1  You can move your arm and shoulder without any pain.