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[Chemical Knowledge]：Difference and Significance Analysis of UN Number and UN Classification of Dangerous Goods

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Dangerous goods UN number and UN classification are important concepts used internationally to distinguish dangerous goods and to identify and transport them. Although they all contain the abbreviation UN, they have different meanings and scope of application. Next, we will analyze in detail the differences between them and their significance in practical work. UN is the abbreviation of United Nations, and the UN number and UN classification related to dangerous goods are developed and managed by the United Nations. First of all, let's look at the UN number of dangerous goods. The UN number for dangerous goods is a numbering system used to identify dangerous goods. It consists of four digits and is used to distinguish different types of dangerous goods. Each type of dangerous goods has its specific UN number, and the same goods in different packaging or state often have different UN number. This also means that the Dangerous Goods UN number is essential for the correct identification and handling of the goods. In the case of sodium chloride, the UN number is NA 2211, while the UN number of sodium chloride solution containing iodine is NA 2212. The UN classification is based on the nature and characteristics of dangerous goods classification system. According to the different characteristics of dangerous goods, the United Nations divides them into different categories and sub-items, thus forming the UN classification system. At present, the UN classification is divided into nine categories, namely: Class 1 explosives, Class 2 gases, Class 3 flammable liquids, Class 4 flammable solids, Class 5 oxidants and organic peroxides, Class 6 toxic substances, Class 7 radioactive substances, Class 8 corrosive products, Class 9 dangerous goods and hazardous wastes. This classification system can help people more accurately understand the dangerous nature of dangerous goods, so as to take appropriate measures to prevent and deal. The UN number and UN classification of dangerous goods are of great significance in practical work. They are essential for the safe transport and storage of dangerous goods. The correct UN number and classification can make transportation companies and storage units more clearly understand the nature and danger of goods, and take corresponding protective measures to avoid accidents. They also play a key role in the correct identification and packaging of goods. According to different UN numbers and classifications, appropriate marking and packaging requirements can be determined to ensure that goods do not pose a hazard to people and the environment during transportation and storage. In general, the UN number and UN classification of dangerous goods are important tools to ensure the safety of dangerous goods transportation, and their correct use is of great significance for the prevention of accidents, the protection of the environment and the safety of personnel. Therefore, we should fully understand and correctly apply these concepts in our work, so as to better ensure the safe transportation and handling of dangerous goods.

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