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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.
A tooth may crack due to a variety of factors: dchewing on hard objects or foods such as ice, nuts or hard candy; dan accident, such as a blow to the mouth; dgrinding and clenching your teeth; duneven chewing pressure; dstress on a tooth; dloss of a significant portion of tooth structure.