It's amazing that something only an atom thick can be an impenetrable barrier. You can have gas on one side and vacuum or liquid on the other, and with a wall only one atom thick, nothing would go through it.

Summary

This quote highlights the remarkable strength and efficiency of materials at the atomic level. Despite being incredibly thin, a single atom-thick barrier has the ability to completely block the passage of gases, liquids, or even vacuum on either side. This emphasizes the exquisite physical properties and potential applications of materials like graphene, which possess unparalleled impermeability and have garnered significant interest in various scientific and technological fields. The quote invites awe and appreciation for the extraordinary capabilities exhibited by such infinitesimally thin barriers.