Any object with mass stores invisible internal energy, and the energy stored by mass is unimaginable.
If the relationship between mass and energy is expressed in mathematical form, the energy stored by an object is equal to the mass of the object multiplied by the square of the speed of light, and the formula is: E = MC 2.
For example, the total thermal energy released by burning a ton of coal in a conventional state is only equivalent to the energy released by 0.028 mg of substance converted into mass, but Einstein himself does not think that a substance can be completely converted into energy in a conventional state.
Extended data:
The collision process of microscopic particles can be divided into elastic collision and inelastic collision.
In the process of elastic collision (also known as elastic scattering), only kinetic energy is exchanged between particles, and the type, quantity and internal motion state of particles remain unchanged.
In the process of inelastic collision (also called inelastic scattering), either the internal motion state of particles changes, or the types and quantities of particles change. At this time, the energy converted between particles is not only kinetic energy, but also energy related to particle transition or particle production and annihilation.
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