Ummm… let me see if I can get you on the same page by laying down some simplified examples first. Keep in mind I’m not a professional anything…
It’s a magnitude stronger than steel as in the same amount of graphene is stronger than the same amount of steel… if you had a toothpick and a similar size steel nail, the nail would be orders of magnitude stronger than the toothpick. Similary, a graphene rod for example of the same size as a steel rod would be orders of magnitude stronger.
A 1×1 meter sheet of graphene assuming 1 single atomic layer thick would be theoretically super strong… in comparison to other things that are 1 atomic layer thick. For reference, pencil lead is made of graphite which is hundreds of thousands of layers of graphene stacked together. So not that strong compared to us, but strong in comparison to other things of its size
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