Graphene smaller amplitude and higher frequency. This phenomenon, named "membrane effect", was predicted by Lifshitz in 1952. A prediction that was published in 2015 suggested a melting point of ≈4125 K. Recent and more sophisticated modelling has increased this temperature to at least 5000 K. At 6000 K (the sun's surface having an effective temperature of 5,777 K) graphene melts into an agglomeration of loosely coupled doubled bonded chains, before becoming a gas. The carbon–carbon bond length in graphene is about 0.142 nanometers. Graphene sheets stack to form graphite with an interplanar spacing of . Graphene is the strongest material ever
Ever 17: The Out of Infinity represented the various scenarios and moods in the game well, and that it was a big improvement over the music in the previous game in the series. In 2010, "RPGFan" ranked the game as the eighteenth best role-playing game of the 2000s, calling it "a pinnacle of visual novels", citing its story, which they called "one of the most emotionally charged, intense, deep, and compelling storylines ever seen in a video game", and the characters, which they said develop believably, ensuring that the player forms an emotional bond to at least one; they called the character of Tsugumi one of