Chemical clock

A chemical clock is a complex mixture of reacting chemical compounds in which the concentration of one component shows an abrupt change accompanied by a visible color effect. The onset of the color change may be used to tell time. Examples of clock reactions are the Belousov-Zhabotinsky reaction, the Briggs-Rauscher reaction, the Bray-Liebhafsky reaction and the iodine clock reaction. These are oscillatory reactions, and the concentration of products and reactants can be approximated in terms of damped oscillations.

Oszillierende Reaktion Reazione oscillante Reakcje oscylacyjne Kemialliset kellot