science
Imagine rolling a single sheet of graphene into a seamless cylinder thousands of times thinner than a human hair.
Carbon nanotubes are famous for being extraordinarily strong for their weight, meaning that for a given mass, they can withstand far greater force than steel or most other engineering materials. This strength comes from the same tightly bonded carbon honeycomb lattice found in graphene, simply rolled into a seamless tube shape thousands of times thinner than a human hair.
Being heavy and brittle is essentially the opposite of what makes carbon nanotubes notable, since their defining trait is being remarkably light yet resilient rather than dense and fragile. Being magnetic at room temperature is not a characteristic property of carbon nanotubes, whose fame rests on mechanical strength and electrical conductivity instead.
Their strength-to-weight ratio is so exceptional that researchers have floated using cables made from them for a hypothetical space elevator, though manufacturing sufficiently long, defect-free tubes at scale remains a major unsolved engineering challenge.
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