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Radiation is classified as a physical hazard because it involves the transfer of energy through space in the form of waves or particles. Physical hazards encompass a wide range of dangers that can cause harm through energy exposure, which includes not just radiation but also noise, extreme temperatures, and mechanical hazards.

In the case of radiation, it can take forms such as ionizing radiation (like gamma rays and X-rays) that can damage living tissue and increase the risk of cancer. This type poses a physical danger due to its inherent properties that can lead to immediate and long-term health effects based on the intensity and duration of exposure.

Other classifications such as chemical hazards relate to substances that can cause harm through toxic reactions. Biological hazards involve living organisms that can lead to diseases, while ergonomic hazards are related to workplace design and repetitive movements leading to musculoskeletal disorders. Understanding radiation as a physical hazard is essential for ensuring proper safety protocols and protection measures are in place for those potentially exposed to it in various work environments.