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
Strongest Man of the Netherlands undisputed champion. In 2015, the 7-time champion wanted to try one last time to become the only man to win 8 times, but Hams got injured just before the match, so another man took his place in the event. Strongest Man of the Netherlands Strongest Man of the Netherlands () is an annual strongman competition held in the Netherlands and featuring exclusively Dutch athletes. The contest was established in 1979, with Gerard Du Prie winning the inaugural contest. Berend Veneberg and Jarno Hams hold the record for most wins with 7. Ted van der Parre holds 3 wins, and Ab