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The UN number and UN classification of dangerous goods are important concepts used internationally to distinguish, label, and transport dangerous goods. Although they all contain the abbreviation UN, they have different meanings and application ranges. 

Next, let's analyze in detail the differences between them and their significance in practical work. UN is the abbreviation of United Nations, and the UN numbers and UN classifications related to dangerous goods are developed and managed by the United Nations. 

First, let's take a look at the UN number of dangerous goods. The UN number for dangerous goods is a numbering system used to identify dangerous goods, consisting of four digits, used to distinguish different types of dangerous goods. Each type of dangerous goods has its specific UN number, and the same goods often have different UN numbers in different packaging or states. 

This also means that the UN number for dangerous goods is crucial for correctly identifying and handling the goods. 

Taking sodium chloride as an example, its UN number is NA 2211, while the UN number of sodium chloride solution containing iodine is NA 2212. UN classification is a classification system based on the nature and characteristics of dangerous goods. The United Nations has classified dangerous goods into different categories and sub items based on their different characteristics, thus forming the UN classification system. At present, 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 substances, Class 9 hazardous materials and hazardous waste. This classification system can help people more accurately understand the hazardous nature of dangerous goods, and thus take appropriate measures to prevent and handle them. 

The UN number and UN classification of dangerous goods have important significance in practical work. They are crucial for the safe transportation and storage of dangerous goods. The correct UN number and classification can enable transportation companies and storage units to have a clearer understanding of the nature and degree of danger of goods, and take corresponding protective measures to avoid accidents. 

They also play a crucial role in the correct identification and packaging of goods. Based on different UN numbers and classifications, appropriate labeling and packaging requirements can be determined to ensure that goods do not pose a threat to personnel and the environment during transportation and storage. 

Overall, the UN number and UN classification of dangerous goods are important tools for ensuring the safety of dangerous goods transportation. Their correct use is of great significance for preventing accidents, protecting the environment, and ensuring personnel safety. Therefore, we need to fully understand and correctly apply these concepts in our work, in order to better ensure the safe transportation and handling of dangerous goods.