化学钟（英语：Chemical clock，又称为化学振荡）是指远离平衡态的化学反应体系，在开放条件下并不趋向稳定，而是围绕稳态以时间为横坐标，中间物浓度出现有节律的极大值或极小值，而且时间有序。
研究人员发现，把红脂乳香树的果实在200度的温度下烘烤20分钟，它们会表现出同烘烤过的咖啡豆类似的极不稳定的化学特征。
The researchers found that when they roasted the P. terebinthus nuts for 20 minutes at 200 degrees they started to show a volatile chemical profile similar to roasted coffee beans.
一旦疼痛记录保持20到40分钟时，身体就会开始产生沉迷依赖类的化学物质以减轻疼痛感。
Once pain has been registered for 20-40 minutes, the body will begin to produce opiate-like chemicals to reduce pain sensation.
当发动机的功率耗尽时，电池在10分钟内就会耗竭——如果连续不充电，它们还能靠化学反应支撑的话。
With the engine performing at full capacity, the batteries would be drained in the space of 10 minutes -- if they were even chemically capable of withstanding such a rapid discharge.
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