# E = MC2, what does C2 really mean?

### 11 Answers

- NickLv 41 month ago
c^2 is the speed of light squared, so the energy of a body is directly proportional to its mass

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- goringLv 61 month ago
E represent the energy of the number of masses that move at the speed of light.

Since no mass can move at the speed of light without breaking its structure,the only single particle that is massive and does not break up at the speed of light is the photon particle (Ahor)

There fore if an atomic mass structure has a Rest Energy content ,it would contain the energy of a particular number of Ahors (Photon. It would have the Energy as follows;

Ep= Mp x C^2..

C^2 represents the speed of light ^2. Mp represents the number of masses of the Ahor(photon)

The Equation of Energy was developed By Emilie Du Chatelet and Rene Des cartes before the French revolution. So the equation of energy indicates that when a mass is caused to move it is said to have Energy.

Energy has 3 components ,with out those components Energy simply does not exist.

NOTE; The Speed of Light changes depending on the density of the Medium its traversing. The speed of light is variant when moving in a gravity field.

From Einstein postulates the velocity of light is really dependent on the motion of its source.

The power of the light radiation is as follows;

P x lambda = Mp x C^3

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- D gLv 71 month ago
C^2 is speed of light squared

The equation means if you convert the energy inside a particle of mass M you get energy in the amount of M x c^2

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- PhilomelLv 72 months ago
You are referring to C^2. That is c multiplied by itself or C*C. C is the speed of light in a vacuum. This is 3*10^8*3*10^8 m/s which equals 9*10^16 m/s^2 which is really quick when compared to a 17-250 bullet which is fairly quick when compared to a bullet fish escaping from a killer squid.

Compare when you hit your thumb with a hammer. You see it happen a long time before you feel it. And you think Oh**it, that's gonna hurt. Then the pain hits you and you no longer care about the speed of light squared. It's all relativity.

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- nebLv 72 months ago
I’m assuming you mean why is c^2 even in the equation. Why not c, or c^3, or some other factor?

‘c’ shows up in many equations in both special and general relativity. They all stem from the same reason and that reason is how the spacetime interval between two events is expressed. Instead of that interval involving space and time expressions, the time expression is converted to a ‘space’ expression by multiplying by ‘c’ . It’s simply the old s = vt formula, with v=c since c is invariant. So, given two events, the separation between two events in spacetime with one space and the time dimension is

s² = x² - c²t²

In relativity, we extend basic classical vectors into spacetime vectors (4-vectors) by adding time components to the space components. Using the above equation, we can find the time component of a 4-vector spacetime velocity which turns out to be ‘c’ in a rest frame (in a rest frame the space components of 4-velocity are all zero. All components are scaled by the γ factor if not in rest frame).

We can form a 4-momentum vector by simply multiplying the 4-velocity by rest mass m, giving a time component of 4-momentum of ‘mc’.

While the above 4-momentum can be used to derive Einstein’s energy-momentum equations by manipulating terms, it’s not intuitive. We turn to how energy is described in general relativity as momentum flow across the 4 constant surfaces in spacetime (e.g. t = constant slice through space). So, rest energy is the time component of 4-momentum ‘mc’ ‘flowing’ at the rate ‘c’ across a constant time surface, mc*c = mc².

The last part probably isn’t super clear but the stress-energy tensor in general relativity is too difficult to go into detail.

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- nebLv 71 month agoReport
Go away Goring

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- billrussell42Lv 72 months ago
I think you mean E = mc², to use the proper symbols

c² is the speed of light squared. In the SI (metric) system that is about 9x10¹⁶ m²/s² or 9x10¹⁶ J/kg

that is, 1 kg of mass converted to energy yields 9x10¹⁶ joules of energy

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- HockeyLv 62 months ago
C is the speed of light. An the 2 stand for squared. So E = M * C *C

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- LônLv 72 months ago
The speed of light x the speed of light...a very large number.

What it means is that if you change a smlall mass into energy you get a massive amount

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- BJJLv 72 months ago
c2 is the speed of light multiplied by the speed light

E=mc^2

E = energy

m = mass

c = the speed of light

186,000 × 186,000

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- MorningfoxLv 72 months ago
It means there are 9 x 10^16 joules (energy) per kilogram (mass). It's just that simple: a number, with units. It's like asking, what does 60 miles per hour "really" mean.

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