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What does activation mean?

Looking for the meaning or definition of the word activation? Here's what it means.

Noun
  1. Making active and effective; bringing into a state of activity.
  2. (physics) The process of making a radioisotope by bombarding a stable element with neutrons or protons.
  3. (biochemistry) The process through which molecules are made able to react.
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The activation energy can be determined by finding the rate constant of a reaction at several different temperatures.
Most organic substances react with oxygen exothermically, but are quite stable, because the activation energy to do so is so large.
Assuming an activation energy of 0.9, this would correspond to an acceleration factor equal to 7.906.
The activation energy is an important factor for predicting changes to material properties.
The energy that is required to activate molecules for a chemical reaction is the activation energy of the reaction.
The sparks generated by striking steel against a flint provide the activation energy to initiate combustion in this Bunsen burner.

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