対つい消しょう滅めつ

noun

annihilation (particle-antiparticle)

Physics term for the mutual destruction of a particle and its antiparticle, converting their mass into energy.

• 電でん子しと陽よう電でん子しが衝しょう突とつすると対つい消しょう滅めつが起おこる。

  When an electron and a positron collide, annihilation occurs.