Energy occupy space or not???

According to Albert Einsteins formula E=mC^2 mass can be converted into energy and energy can be converted into mass. But a mass occupy some space bu

According to Albert Einstein's formula E=mC^2 mass can be converted into energy and energy can be converted into mass. But a mass occupy some space but not energy why???

or:According to Albert Einstein's formula E=mC^2 mass can be converted into energy and energy can be converted into mass. But a mass occupy some space but not energy why???

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