|An activation energy diagram, showing the energy barrier, separating reactants from products.|
Reactants → Products
“The radiations that pour upon the earth cause the biosphere to take on properties unknown to lifeless planetary surfaces, and thus transform the face of the earth. Activated by radiation, the matter of the biosphere collects and redistributes solar energy, and converts it ultimately into free energy capable of doing work on earth.”
See main: Social activation energyThe study of activation energy in human chemistry is a complex subject, being that a number of potential theories can be used to explain the activation energy aspects of human chemical reactions, such as molecular orbital orientation, entropy of activation, heat (e.g. summer vs winter), trajectory collisions, catalysts, human catalysts, substrate factors (e.g. renting vs owning), among other aspects.