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Refractive index: Strictly speaking, it is the ratio of the speed of light in a vacuum to its speed in a material. The refractive index value commonly used is the ratio of the speed of light in air to its speed in a substance saturated with air. The value of the refractive index is related to the wavelength of light, as well as the chemical composition and density, temperature, and pressure of the material through which the light passes. Under identical other conditions, alkanes have the lowest refractive index, aromatic hydrocarbons the highest, while alkenes and cycloalkanes fall between them. For naphthenes and aromatics, the greater the number of rings in the molecule, the higher the refractive index. The refractive index of oils is commonly used to determine the hydrocarbon family composition of these oils; in intermediate product analysis at refineries, the refractive index is also employed to determine the residue value. Welcome to in-depth discussions============================================= Discussions on the two-stage combined cracking process can be found at http://bbs.hcbbs.com/thread-1560503-1-1.html (Source: Haichuan Chemical Industry Forum). [Petroleum and Chemicals Section] A compilation of professional “basic knowledge” posts is being carried out (the large forum offers surprises and prizes for participants). More information is available at http://bbs.hcbbs.com/thread-1557057-1-1.html (Source: Haichuan Chemical Industry Forum). Here, we encourage various groups to create or individuals to post basic knowledge-related posts; the content can be gathered from the Internet or created originally. Participants can choose from various topics, and there are no restrictions on the way in which they present their content – it could be an explanation of a noun or an introduction to a series of principles. What are some suggestions and methods for getting in touch with cleaners? The regular administrator will reward the content that performs well. You will also be rewarded for regions where the activities are more intensive. (Regions should also carry out summarization and optimization based on the amount of such content available in their area.) ———————————————— The second phase of the event runs from February 20, 2016, to the end of June 2016; at least 50 award vouchers are available for you to claim (mugs, power banks, USB drives, and other prizes or event benefits). Awards can be given at any time based on performance, and additional rewards can also be granted at any time depending on performance. (12,000 event points and rewards await those regions that perform well)