The endothermic energy is released when the bond breaks between the atoms. The thermal kinetic energy is stored between the bonds of the nitroglycerin molecule.
Thermal energy is the total of the kinetic and the potential energy. The kinetic energy is the energy possessed by the object respective to its motion.
The potential energy is the stored energy with respect to the position of the object. The combination of kinetic and potential energy makes the thermal energy and is in the form of heat.
Therefore, the release of the heat from bonds indicates thermal kinetic energy.
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