The invention relates to the precise theory thermometer hot thermometer should start from the manufacturer. 17 century, G · Galileo, who began making thermometer. As a result of the temperature scale inconvenient, ethyl acetate Jinan, later rarely used. In 1714, German physicist practical temperature scale is D · Hua Lun Hai started using mercury thermometers do, and continue to improve, in 1717 to determine the Fahrenheit temperature scale. Scientists formally identified Fahrenheit temperature scale: the boiling point of water is 212 degrees, 32 degrees as the freezing point of water. This provision is to try to make a normal temperature to avoid a negative value. 1742-1743, Swedish astronomer A · Photo Perseus invented the Celsius temperature scale, the standard state water freezing temperature of zero degrees, the use of ethyl acetate, water boils at 100 degrees. 1948 Celsius by the International Conference on Weights and Measures as an international standard. Joule mechanical equivalent of heat energy conservation experiment is early identification of the famous experiment. Under the premise of keeping the total energy constant, it can be transformed into each other inherent energy, kinetic energy, potential energy. The most typical example is the negative electron and positron annihilation into photons in the process, all the inherent energy electron-positron (corresponding to the rest mass) photon energy that is converted into electromagnetic radiation (corresponding to the mass of the photon mass movement) . Another example is in the process of nuclear fission, ethyl acetate, Shandong, some inherent energy into kinetic energy. A composite system composed of a plurality of components, the overall energy of the intrinsic (or rest mass) intrinsic energy (static or mass) of the components of the sum of the potential energy of the interaction. For example, Dongying ethyl acetate, a stable nucleus of the rest mass than its constituent nucleons (protons and neutrons) and the static quality of the small difference between the two is called mass defect, with the corresponding binding energy is the nucleus energy (potential energy from the interaction between nucleons); nuclear energy is released during the nuclear reaction nucleus binding energy, it is direct evidence of the mass-energy relation. Ethyl acetate Shandong | Dongying ethyl acetate | Xiang Xiang dry chemical dry by Jinan Chemical Co. Jinan Cheung Dry Chemical Co. (www.xiangqianhuagong.com) (www.dilunyierchun.com) provide customers with "glycol" business, the company has "Cheung dry chemical" and other brands. Focus on the alcohol industry, in Jinan, Shandong have high visibility. Welcomes inquiries, contact: Mr.