What Exactly is Energy and How Does it Convert to Mass?

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Discussion Overview

The discussion revolves around the concept of energy, its definition, and its relationship to mass, particularly in the context of string theory and quantum mechanics. Participants explore various interpretations of energy, questioning its tangible nature and how it relates to physical entities like strings and photons.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants question the definition of energy, suggesting it may be used loosely in discussions about string theory.
  • One participant states that energy is the potential to do work, but others argue this does not clarify what energy actually is.
  • There is a claim that energy is a sum of calculations rather than a tangible entity.
  • A participant raises the point that while a photon has energy, it is not energy itself, leading to further exploration of the nature of energy.
  • Another participant suggests that the concept of energy might be figurative, as they question how something intangible can take the form of a string.
  • One participant posits that mass can be viewed as "frozen energy," prompting further inquiry into the conversion of energy into mass through string vibrations.
  • There is a reference to the revolutionary nature of the equation E=mc², with participants discussing its implications for understanding the connection between mass and energy.

Areas of Agreement / Disagreement

Participants express differing views on the nature of energy, with no consensus reached on its definition or whether it can be considered a tangible entity. The discussion remains unresolved, with multiple competing interpretations presented.

Contextual Notes

Participants highlight limitations in their understanding, such as the abstract nature of energy and its representation in physical theories. There is an acknowledgment of the complexity surrounding the relationship between energy and mass, particularly in the context of string theory.

The thinker
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Do we know what energy "is"?

Hi everyone,

According to what I have read a string is a minute amount of vibrating energy. Is the word "energy" here used as an approximate for the lay reader?

I was led to this thought because if the vibration of strings make up matter and energy then what's the difference between the "macro energy" produced by vibration and the "pure" non vibrating energy?

Basically I'm asking, what is energy?

Thanks!
 
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Energy is the potential to do work.
 


Topher925 said:
Energy is the potential to do work.

That doesn't really answer what energy is though just what it does.

I can't imagine a string of "potential to do work"
 


Energy is the sum of a calculation, not a tangible thing.

k
 


kenewbie said:
Energy is the sum of a calculation, not a tangible thing.

k

Thats what I used to think, but don't they say that a photon is a packet of energy?

And like I said before how can an intangible thing take the form of a string?
 


A photon has energy. It isn't energy itself. Energy is not a "thing". You're looking for a deeper meaning where none is necessary.
 


The thinker said:
Thats what I used to think, but don't they say that a photon is a packet of energy?

And like I said before how can an intangible thing take the form of a string?

It doesn't. All this is figurative talk. As Russ said, you can eventually say that a string HAS energy (or momentum or mass, or whatever other quantifiable property). The only thing that IS energy is a quantity in a calculation.

To give you an analogy: is a bank "interest rate" ?
 


Better: Is a bank money?
 


jtbell said:
Better: Is a bank money?

I was going to say that first, but money also has a tangible representation (paper money, or gold bars, or...), so this was not sufficiently abstract...
 
  • #10


hahaha, that's what I used to think until I started reading about string theory and QM which confused me into thinking energy was physical.

So now I have two other questions:

If there is no such thing as pure energy then what is a string?

And what was so revolutionary about E=mc^2 if E is not a real thing?

Thanks again!
 
  • #11


E=mc^2 was revolutionary because no one had connected matter and energy in that way before.
 
  • #12


well when you think about it, energy is primarily mass. Mass is like frozen energy. It really makes you think, what exactly is energy. But when a string vibrates, it gets energy, energy converts into mass.
 

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