Final answer:
The U.S. Department of Transportation (DOT) has established the United National/North America (UN/NA) four-digit numbering system to identify materials in order to maintain safety standards and ensure proper handling of hazardous materials.
Step-by-step explanation:
The U.S. Department of Transportation (DOT) has established the United National/North America (UN/NA) four-digit numbering system to identify materials.
This system is used to categorize hazardous materials and ensure their safe transportation.
Each material is assigned a unique number based on its properties and characteristics.
For example, gasoline is assigned the UN/NA number 1203.
This number helps emergency responders and transportation personnel identify the material and take appropriate safety measures in case of accidents or spills.
The UN/NA numbering system is essential for maintaining safety standards and ensuring the proper handling, storage, and transportation of hazardous materials.