E=mc²: Einstein explains his famous formula

[UltimateUnknown]

kain_kusanagi said:

Dodece said:
Technically speaking the equation is incorrect. We now know that the speed of light isn't constant. Scientists in the laboratory have managed to slow light down considerably, and via quantum tunneling light can move faster then it would typically move. That isn't to say the equation doesn't work. Just that something thought to be a constant is not in fact a constant.

So the equation isn't actualy "incorrect". What you're saying is that it is unreliable due to the inconsistancy of the speed of light.

No the equation isn't incorrect as it assumes the speed of light under vacuum, a very specific case. Speed of light does vary between different media but it remains constant under vacuum, which is proven through experimentation.

And the equation definitely does work because the electricity generated from nuclear power is done on the basis of conversion of mass to energy.