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Our doctor said it is not stand for activation. it stands for something else, any help will be appreciated.

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  • $\begingroup$ Comments are not for extended discussion; this conversation has been moved to chat. $\endgroup$
    – jonsca
    Commented Jan 28, 2019 at 22:59

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The subscript $\mathrm a$ in $E_\mathrm a$ may refer to Arrhenius.
The IUPAC gold book states that:

activation energy (Arrhenius activation energy)
An empirical parameter characterizing the exponential temperature dependence of the rate coefficient, $k$, $E_\mathrm a = RT^2 \frac{\mathrm d(\ln k)}{\mathrm dt}$, where $R$ is the gas constant and $T$ the thermodynamic temperature.

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    $\begingroup$ You haven't read any of the comments to the question, have you? :) $\endgroup$
    – andselisk
    Commented Jan 28, 2019 at 18:22
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any one interested, the answer of our doctor is a stands for apparent or approximation value of activation energy. thanks for everyone

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