Why solid carbon dioxide is called dry ice class 9?
Question: Why solid carbon dioxide is called dry ice class 9?
Solid carbon dioxide is called "dry ice" because it does not melt into a liquid form when it transitions from a solid to a gas. Instead, it sublimates directly from a solid to a gas, skipping the liquid phase entirely. This process results in a release of cold, fog-like vapor, which is why it's called "dry" ice.
The term "class 9" in the context of dry ice usually refers to the United Nations (UN) classification system for dangerous goods, which is used to ensure the safe transportation of hazardous materials. In this system, dry ice is classified as a Class 9 miscellaneous dangerous good due to the fact that it is extremely cold and can cause severe frostbite if handled improperly.
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