Final answer:
A chemical- liquid ammonia burn occurs when skin comes into contact with liquid ammonia, causing caustic burns and tissue damage.
Step-by-step explanation:
A chemical- liquid ammonia burn refers to tissue damage caused by exposure to ammonia in its liquid state. Ammonia (NH3) is a compound consisting of nitrogen and hydrogen atoms. It is commonly used as a refrigerant, in fertilizers, and in industrial processes like the Haber process for producing ammonia itself. This substance becomes a colorless liquid under pressure, boiling at -33 °C, and exhibits a sharp, pungent odor. Although useful, it is important to handle liquid ammonia with care because it can cause severe burns upon contact with skin, due to its caustic nature. These burns occur because the ammonia can disrupt cell membranes and lead to cell death upon exposure.