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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.
Question: Why do people crack knuckles? Answer: Cracked knuckles feel looser and enjoy more mobility for a while after cracking. It is also possible that as kids people realize that cracking knuckles produces a funny noise and may repeat cracking just to produce the sound. This may make some people habitual âknuckle crackersâ. Question: What causes the sound? Answer: Joints (knuckles) are covered by a capsule (the joint capsule or synovial capsule). Within the space of this capsule the synovial fluid is contained which acts as a lubricant and also contains nutrients for the adjacent bone surfaces. A variety of gases are continuously dissolved in this fluid.