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I recently came across an article from Stanford Encyclopedia of Philosophy titling "The Equivalence of Mass and Energy"

(link: http://plato.stanford.edu/entries/equivME/#2.2 )

which has really confused me about the nature of mass an energy.

The article contains many interpretations of E=mc[itex]^{2}[/itex]

And one of them titled

"Mass and Energy are different measurements of the same thing. By choosing units properly we can make c=1 and thus there is actually no difference between them. Mass and energy are the same property of physical systems. Consequently, there is no sense in which one of the properties is ever physically converted into the other."

(The article also gives book References:

1. Torretti, R. (1996), Relativity and Geometry, New York: Dover.

2. Eddington, A. (1929), Space, Time, and Gravitation, London: Cambridge University Press)

Now, does E = mc[itex]^{2}[/itex] actually means that mass and energy are same?

Also I find many other interpretations and many book references supporting them like:

Bondi and Spurgin argued that Einstein's equation does not entail that mass and energy are the same property. But they can not be converted into each other.

(Ref: Bondi, H. and Spurgin, C.B. (1987), “Energy has mass,” Phys. Bull., 38: 62–63)

Another one:

Mass and Energy are different properties but they can be converted. (Ref: Rindler, W. (1977), Essential Relativity, New York, N.Y.: Springer-Verlag.)

As a student of introductory level, I am absolutely confused about the

(link: http://plato.stanford.edu/entries/equivME/#2.2 )

which has really confused me about the nature of mass an energy.

The article contains many interpretations of E=mc[itex]^{2}[/itex]

And one of them titled

**Same-property interpretations of E = mc[itex]^{2}[/itex]**says something like this:"Mass and Energy are different measurements of the same thing. By choosing units properly we can make c=1 and thus there is actually no difference between them. Mass and energy are the same property of physical systems. Consequently, there is no sense in which one of the properties is ever physically converted into the other."

(The article also gives book References:

1. Torretti, R. (1996), Relativity and Geometry, New York: Dover.

2. Eddington, A. (1929), Space, Time, and Gravitation, London: Cambridge University Press)

Now, does E = mc[itex]^{2}[/itex] actually means that mass and energy are same?

Also I find many other interpretations and many book references supporting them like:

Bondi and Spurgin argued that Einstein's equation does not entail that mass and energy are the same property. But they can not be converted into each other.

(Ref: Bondi, H. and Spurgin, C.B. (1987), “Energy has mass,” Phys. Bull., 38: 62–63)

Another one:

Mass and Energy are different properties but they can be converted. (Ref: Rindler, W. (1977), Essential Relativity, New York, N.Y.: Springer-Verlag.)

As a student of introductory level, I am absolutely confused about the

**nature of mass and energy**(are they same or different?) and**what E=mc[itex]^{2}[/itex] actually suggests**?
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