What does E(nergy) = m(ass) (times c^2) mean?

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Discussion Overview

The discussion revolves around the meaning of the equation E=mc², specifically focusing on the concepts of inertial mass and energy. Participants explore the relationship between mass and energy, particularly in the context of nuclear reactions and the implications of the equation in various scenarios.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant expresses confusion about the meaning of inertial mass and its relationship to energy, noting the connection to nuclear reactions.
  • Another participant suggests that the equation indicates that rest mass can be converted into energy, such as gamma radiation, or that energy can contribute to the mass of a system.
  • A later reply mentions the abundance of online resources, emphasizing the variability in the quality of explanations based on individual backgrounds.
  • Some participants propose specific videos as helpful resources for understanding the equation, while also acknowledging that some discussions may present alternative views on the formula.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a singular explanation of E=mc², and multiple interpretations and resources are presented, indicating ongoing debate and exploration of the topic.

Contextual Notes

Some limitations include the varying definitions of mass and energy, the complexity of the concepts involved, and the potential for differing interpretations of the equation based on individual understanding.

sayetsu
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I know m isn't matter; it's inertial mass, but I don't know what that means or how it "equals" energy. I've never found an explanation I understood, so I thought I'd try asking here. Matter can be converted to energy, though, right? That's how nuclear bombs work, or hydrogen bombs...my recollection's a little fuzzy.
 
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Can you not find a good explanation on line?
 
It means that a body of rest mass ##m## releases energy ##E## if converted to some form without rest mass (e.g. gamma radiation). Or alternatively that energy ##E## contributes ##m## to the mass of some system in its rest frame.
 
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Hi Sayetsu

There are literally hundreds of videos you can find; the challenge is finding the "good" ones - which will differ for most people depending on background etc

Based on your question I would try these two (in this order)
Special Relativity (E = mc2) Explained A Four minute reminder of what you asked

Why E=mc² is wrong An extra 6 minutes that either reminds you / tells you that there's a bit more to the formula that doesn't often get discussed.
 

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