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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.
The sound of a knuckle being cracked (pictured: a common knuckle-popping technique). Cracking or popping of joints is the action of joint manipulation to produce a sharp cracking or popping sound. This commonly occurs during deliberate knuckle-cracking. It is possible to crack many joints, such as those in the back and neck vertebrae, hips, wrists, elbows, shoulders, toes, ankles, knees, jaws, feet, sternum, and the Achilles tendon area.