When a particle and its antiparticle meet, they can annihilate each other, converting their masses into energy according to Einstein's famous equation, E=mc². The total energy released in the annihilation process depends on the masses of the particles involved.
If the particle and antiparticle have equal masses, their entire mass can be converted into energy. In this case, the annihilation process is known as "complete annihilation" or "total annihilation." The resulting energy can manifest in various forms, including photons (particles of light) or other types of elementary particles.
However, if the particle and antiparticle have different masses, only a fraction of their total energy will be released during annihilation. The remaining energy may be carried away by other particles or remain as potential energy within the newly created particles. In such cases, the annihilation is referred to as "partial annihilation."
It's important to note that the concept of "full energy" can be a bit ambiguous, as the energy released during particle annihilation depends on the masses of the particles involved. The conservation of energy still holds true, but the distribution and form of the released energy can vary depending on the specific scenario.