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.
策略性位置的最佳观赏是个照管飞船，配备仪器的羽毛的化学将近四分钟，直到它太撞上火山口。
Strategically positioned for optimal viewing was a shepherding spacecraft, outfitted with instruments to pick apart the plume's chemistry for nearly four minutes, until it too crashed into the crater.
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