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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.
Cracking joints. 1  Cracking finger joints (knuckles) --Cracking joints is the act of pulling bones apart to release air bubbles in the joints, which does not cause arthritis. 2  The sound of a knuckle being cracked (pictured: common knucklen joints) happens when joint manipulation in humans produce a sharp cracking or popping sound.