First-order Process : A first order process is a chemical process where the rate is directly proportional to the amount of chemical present. Any process changing at a constant fractional rate
Heriot-Watt University, School of Life Sciences, Some Terms Used In Toxicology and Chemical Safety, Edinburgh, UK 1992. http://www.who.int/ipcs/publications/methods/harmo nization/en/compilation_nov2001.pdf, (Tox and Chem Sfty - Amer) {85}