Also contains definition of: degree of activation
This word is used in different senses:
  1. Input of external energy into a chemical system is said to bring about activation of the system.
  2. An added substance that increases the rate of a catalysed reaction is known as an @A00104@, and the effect is called activation. The degree of activation \(\varepsilon_{\text{a}}\) is defined by: \[\varepsilon_{\text{a}}=\frac{v\,-\,v_{0}}{v_{0}} = \frac{v}{v_{0}} - 1\] where \(v_{0}\) is the rate of the catalysed reaction in the absence of the @A00104@ and \(v\) is the rate of the catalysed reaction in the presence of the @A00104@.
  3. When some of the energy required for a reaction to occur is provided by a previous exothermic chemical reaction there is said to be @C01017@.
chemical activation
See also:
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 151 [Terms] [Paper]