= Humidity-temperature response of OH production
At fixed <relative humidity> and fixed excited-oxygen <concentration>, a water-reaction <hydroxyl radical> source scales as $e_s(T)/T$ when <concentrations> are number densities. Thus $d\ln P_{\rm OH}/dT=\Delta H_{\rm vap}/(RT^2)-1/T$ under constant <latent heat> and rate coefficient. Using only $e_s$ instead gives a <vapor pressure> or fixed-pressure mole-fraction approximation. Neither derivative follows without a <humidity> condition.
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