OK, I see the error I'm making. It's not saying that the mass is energy, just that it can be converted to that much energy. So my comparisons to say length conversion are wrong. Still the point is that the c2 is just a conversion factor. Essentially it's just saying that mass is a form of energy, and c2 part gets the value and units correct.
OK, I see the error I'm making. It's not saying that the mass is energy, just that it can be converted to that much energy. So my comparisons to say length conversion are wrong. Still the point is that the c^2 is just a conversion factor. Essentially it's just saying that mass is a form of energy, and c^2 part gets the value and units correct.
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