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Graphene (/ ˈ ɡ r æ f iː n /) [1] is a carbon allotrope consisting of a single layer of atoms arranged in a honeycomb planar nanostructure. [2] [3] The name "graphene" is derived from "graphite" and the suffix -ene, indicating the presence of double bonds within the carbon structure.
Pittsburgh (/ ˈ p ɪ t s b ɜːr ɡ / PITS-burg) is a city in and the county seat of Allegheny County, Pennsylvania, United States.It is the second-most populous city in Pennsylvania (after Philadelphia) and the 68th-most populous city in the U.S., with a population of 302,971 as of the 2020 census.
In economics, hyperinflation is a very high and typically accelerating inflation.It quickly erodes the real value of the local currency, as the prices of all goods increase.