Appearance: White powder ; Hygroscopic fine white powder ; Finely divided white particulate dispersed in air. [Note: Exposure may occur when magnesium is burned, thermally cut, or welded upon.]
NH3
Names: Ammonia, Azane (only intended for use in naming derivatives of ammonia), Hydrogen nitrideAmmonia (anhydrous), Azane, NH3, Trihydrogen nitride, R717, Refrigerant gas 717, Anhydrous ammonia, Aqua ammonia, Aqueous ammonia, [Note: Often used in an aqueous solution.]
Appearance: Colourless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a pungent, suffocating odor. [Note: Shipped as a liquefied compressed gas. Easily liquefied under pressure.]