Changing states doesn't involve turning one into the other. Changing states has to do with the condition of energy and matter, but theres no way you can interchange them. That's like saying you can turn electricity or heat into something with a definite mass, which isn't at all possible.
Sure, energy is stored in matter; it's what holds everything together, but that doesnt mean that they're at all the same.
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Ross
SRMC
bogart!