Which type of burn is NOT primary in the exposure to liquid Ammonia?

The type of burn that is not primary in the exposure to liquid ammonia is a chemical burn. When liquid ammonia comes into contact with the skin, it primarily causes thermal burns due to its extremely low temperature, which can lead to frostbite-like injuries. Ammonia is also known to cause caustic burns because it is a strong alkaline substance that can damage tissues and irritate the skin upon contact.

Dehydration burns are not typically associated with liquid ammonia exposure either; however, if ammonia were to evaporate rapidly from the skin's moisture, it may contribute to dehydration, but this is not the main mechanism of injury. In essence, while ammonia is a chemical that can burn, the specific context of the exposure primarily results in thermal and caustic injuries. Therefore, the classification of a burn caused by liquid ammonia exposure does not align with it being considered a chemical burn in this context.