Energy exists within the coal, but in the form of the chemical bonds created during its fossilization. For the stored energy within coal to be released, heat is added as the activation energy. An analogy of this is that the stored energy within the coal is like a stretched piece of rubber. There is surely energy stored in the stretched rubber, but it is not being released. The activation energy for the stretched rubber is like a blade that severs the strand. The severing of the rubber releases the energy that was stored within it. Heat is the blade that severs the chemical bonds and releases the stored energy. The energy released from the coal is in the form of heat.
Stored Energy in Coal Molecules
Releaseded Energy in Coal Molecules
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