The lowest energy level state is called ground level (E0 = 0), the remaining energy level called the excited state level, while the lowest energy excited state is referred to as the first excited state. Under normal conditions, atoms in the ground state, extranuclear on the respective lowest energy orbital motion. If some external energy such as solar energy supplied to the ground state atom, when the outside light energy E is exactly equal to the energy difference between the ground state atom in the ground state E and a higher energy level between the price of butyl acetate, the atoms will absorb this a characteristic wavelength of light, the outer electron transitions from the ground state to the corresponding excited states. The original light provides energy spectral lines after missing some characteristic spectral lines, resulting atomic absorption spectrometry. Electronic transitions to a higher level in the excited state after the sec-butyl acetate, but excited electrons are unstable after about 10-8 seconds later, excited electrons return to the ground state or other lower level, and when the electronic transition released out energy absorbed in the form of light, this process is called atomic emission spectrometry. Atomic absorption spectroscopy visible radiation energy absorption process, while atomic emission spectrometry process releases energy radiation. Diffusion experiments in perfume, perfume will evaporate butyl acetate, quotes, perfume molecules evenly distributed throughout the room. This process is irreversible. Regardless of how long to wait, perfume molecules are no longer concentrated in the bottle to go, a particular molecule might turn around and go back down to its original trajectory, does not violate the laws of physics. Because the dominant law of molecular motion is symmetric with respect to time reversal, the initial state, the final state butyl acetate served two points, each point of the whole is the result of another point, the initial state is extremely rare, is the root cause irreversible. Directionality of time is due to any physical process, the state point of the system is turned from a relatively orderly no order. In a more complex event also seems to exist directional research. Some people say: "the car from the parking lot to open up, than the car parked in the parking lot easier than to fight with great difficulty breaking the glass with crushed glass blocks to spell it easier than messing pattern to hit a person. Death is easier than save a man. "(excerpt from the Nobel Physics Prize winner Cooper's book). Cangzhou butyl acetate, butyl acetate, price, Cheung dry chemical (certified merchants) from Jinan Cheung stem Chemical Limited. Jinan Cheung Dry Chemical Co. (www.xiangqianhuagong.com) (www.dilunyierchun.com) is specialized in the "glycol" enterprise, the company of "honesty, hard service" concept, to provide you with the most quality products and services. Welcome to inquire! Contact: Mr. You can also access (www.dilunyierchun.com/supply_details_39798235.html), for more information about the company.