Matter/antimatter annihilation and conservation of mass

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Discussion Overview

The discussion centers on matter-antimatter annihilation and its implications for the conservation of energy and mass. Participants explore the nature of annihilation, the transformation of mass into energy, and the validity of conservation laws in different contexts, including subatomic physics and chemistry.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants describe matter-antimatter annihilation as a process where both particles are annihilated, producing energy, and question whether this contradicts conservation laws.
  • One participant asserts that energy is conserved during annihilation, as the mass of the particles contains energy that transforms into radiation, such as gamma rays.
  • Another participant claims there is no conservation law for matter in subatomic physics, contrasting it with chemistry where conservation of matter applies to nucleons and electrons.
  • A participant references nuclear reactions as an example of mass loss correlating with energy transfer, suggesting that understanding these processes may require knowledge of quantum electrodynamics.

Areas of Agreement / Disagreement

Participants express differing views on the conservation of mass and energy, with no consensus reached on whether matter-antimatter annihilation contradicts established conservation laws.

Contextual Notes

Participants highlight the distinction between conservation laws in chemistry and subatomic physics, indicating that assumptions about mass conservation may depend on the context of the discussion.

Sheets.256
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I was hoping to learn a little bit more about matter-antimatter annihilation. As I understand it, when a particle meets an antiparticle, they are both annihilated and energy is produced. Does this contradict the laws of conservation of energy and conservation of matter? I haven't had much luck finding the answer online or in other threads here, but if there's anything you could refer me to, I would appreciate it.
 
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Sheets.256 said:
I was hoping to learn a little bit more about matter-antimatter annihilation. As I understand it, when a particle meets an antiparticle, they are both annihilated and energy is produced. Does this contradict the laws of conservation of energy and conservation of matter? I haven't had much luck finding the answer online or in other threads here, but if there's anything you could refer me to, I would appreciate it.

Nothing wrong with annihilation of matter-antimatter... the 2 particles that get annihilated, produce for example 2 gamma rays that carry the energy/momentum needed.
 
There is no energy produced, energy is conserved. The mass of the particles has energy as well. This energy can get transformed to something else, like radiation.
There is no conservation law for matter.
 
There is only conservation of matter (nucleons and electrons) in Chemistry probably. When it comes to subatomic physics there is no such thing.

A more familiar example is in a nuclear reaction, there is loss in mass. For rest particles, we have E = m0c2, so the mass loss is an indication of lost energy which is transferred to the outgoing particles (e.g. photon).

To properly understand the real theoretical foundation of such process, you might need to look at lowest order quantum electrodynamics processes.
 

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