What is it?
Anhydrous ammonia is a widely used, efficient form of nitrogen fertilizer. When used in agriculture, it's compressed into a clear, colorless liquid and stored at extremely low temperatures. In its natural form, in the open air, it's a gas, so agriculturists use special equipment to compress and handle it, storing it in tanks that can withstand 250 psi. But outside of that tank, it quickly reverts back to its gaseous state. Contact with it as a liquid can cause severe chemical burns and inhaling it can cause damage to the lungs. The "anhydrous" portion of it--"without water"--refers to the fact that the chemical reacts with water, meaning the effects are especially damaging when they combine with the human body's moisture, whether that's in the eyes, lungs, or other parts of the body. When that happens, the reaction forms a highly basic solution that's very corrosive.