Mechanical energy nonconservative forces, like frictional forces, will be present, but often they are of negligible values and the mechanical energy's being constant can therefore be a useful approximation. In elastic collisions, the mechanical energy is conserved but in inelastic collisions, some mechanical energy is converted into heat. The equivalence between lost mechanical energy (dissipation) and an increase in temperature was discovered by James Prescott Joule. Many devices are used to convert mechanical energy to or from other forms of energy, e.g. an electric motor converts electrical energy to mechanical energy, an electric generator converts mechanical energy into electrical energy and a
Dalian most liveable city in China according to "China Daily". Standard Mandarin is usually spoken in Dalian because it is a city with people from various locations. But Dalian natives use Dalian dialect, which belongs to the Jiaoliao Mandarin subgroup spoken in parts of Shandong and Liaoning provinces. Most of the residents of Dalian were farmers and fishermen who had come from Shandong Province in a large population move, the "Chuang Guandong", during which era Dalian was occupied by the Japanese as the Kwantung Leased Territory. The Dalian dialect incorporates a few loanwords from Japanese and Russian (very rare in Chinese),