Introduction to molecular spectra molecules change from one energy state to another energy state absorption or emission spectroscopy (which may include up from the ultraviolet to the far infrared microwave spectrum). Molecular spectroscopy and molecular around the axis of rotation, the molecule vibrations and molecule atoms in the equilibrium position corresponding to the electronic transition. Emission and absorption spectra formation transitions between energy levels of molecular classification. Molecular spectroscopy is very rich, can be divided into pure rotational spectrum, vibration - rotation spectrum band and electronic spectral bands. Pure rotational spectrum of molecules produced by molecular rotational transitions between energy levels, located in the far-infrared uses butyl acetate, usually the main observation absorption spectroscopy; vibration - rotation spectra with different vibrational levels by the turning on of the level of transitions between generation, some dense lines, located in the near-infrared band, usually the main observation absorption spectroscopy; electronic bands produced by different vibrational transitions and different rotational energy levels between different electronic states can be divided into many bands acetate butyl price, distributed in the visible or ultraviolet wavelengths, the emission spectrum can be observed. Due to the absence of non-polar molecules electric dipole moment, no rotational vibration spectrum and - rotational spectrum band, only the polar molecules have such spectral bands [2]. The first law of thermodynamics gives heat and power relationship between the number of mutual transformation. In order to improve the efficiency of a heat engine, 1824 Kano Kano made famous theorem, his conclusion is correct, but he cited the wrong "thermal mass theory." To further clarify the Carnot theorem, 1850 Clausius proposed second law of thermodynamics, he said: "The object is not possible to spread the heat from a low temperature hot object without causing other changes" sec-butyl acetate, equivalent heat conduction process irreversibility. 1851 Kelvin said: "can not take the heat from a single source to make it completely into useful work without causing other changes", the equivalent of irreversibility frictional heat process. In addition to these two statements, the second law of thermodynamics, there are several different narrative between them are equivalent. In the study of chemical reactions GB butyl acetate, need to determine the entropy of reference state. In 1912, Nernst proposed third law of thermodynamics, that absolute zero temperature is impossible to achieve. Other scientists have proposed several different way of expression, which in 1911 Planck formulation is more clear, that is, "with no reversible isothermal entropy change process associated with the temperature close to zero and close to zero." . This law is very important to provide a fundamental principle of chemical equilibrium. Xiang dry chemical (Figure) | GB butyl acetate | Shanxi butyl acetate stem from Jinan Cheung Chemical Limited. Jinan Cheung Dry Chemical Co. (www.xiangqianhuagong.com) (www.dilunyierchun.com) adhere to the "people-oriented" business philosophy, has a professional staff, and strive to provide the best products and services to contribute to the community, and welcome to new and old customers to visit us and sincere cooperation for a better future. Xiang dry chemical - your trusted friend, Company Address: Industrial Road chemical market, Contact: Mr. You can also access (www.dilunyierchun.com/supply_details_41525450.html), for more information about the company.