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Thermal cracking. In thermal cracking, high temperatures (typically in the range of 450Â°C to 750Â°C) and pressures (up to about 70 atmospheres) are used to break the large hydrocarbons into smaller ones. Thermal cracking gives mixtures of products containing high proportions of hydrocarbons with double bonds - alkenes.
Cracked and Fractured Teeth. Because people are living longer and dentists are helping keep teeth longer, teeth are being exposed to years of crack inducing habits. Particularly, clenching, grinding, and chewing hard things such as ice can result in cracks and fractures in teeth. Typically teeth with cracks/fractures do not show on radiographs (x-rays). Hence, cracked and fractured teeth can especially be difficult to locate.