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Thermal properties of oils (III): Enthalpy, one of the thermodynamic functions. The absolute value of enthalpy cannot be determined, but the change in enthalpy between the initial and final states of a process can be measured. For convenience, the enthalpy value is artificially set to zero at a certain state, which is called the reference state. The change in enthalpy that occurs when a substance changes from its reference state to a specified state is called the enthalpy value of that substance at that state, with the unit being kJ/kg. The enthalpy of oil products is related to their chemical composition. At the same temperature, the lower the density of the oil, the greater its specific factor, and thus its enthalpy value is higher. ============================================= Two posts on combined cracking processes: 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 support; amazing prizes are available for those who participate). http://bbs.hcbbs.com/thread-1557057-1-1.html (Source: Haichuan Chemical Industry Forum). This initiative encourages various sections to organize, or individuals to create, posts on basic knowledge topics; the content can be gathered from the Internet or created originally. Participation can take place through multiple themes, with no restrictions on the approach used – it could be an explanation of a single term 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). Prizes are awarded at any time based on performance, and additional rewards are given as well at any time depending on performance. (12,000 event points and rewards await those regions that perform well)