The compound hydrogen chloride has the chemical formula HCl and as such is a hydrogen halide. It is a colourless gas at room temperature which, upon contact with atmospheric water vapor, forms white fumes of hydrochloric acid.
A colorless, nonflammable gas with an acrid odor is hydrogen chloride. At -121 °F, the gas condenses to a liquid and freezes into a solid at -173.2 °F. Hydrochloric acid is a colorless, smoky liquid with an odor that is unpleasant.
There are many applications for hydrogen chloride, including washing, pickling, electroplating, tanning leather, and processing and manufacturing a wide range of products. During the burning of many plastics, hydrogen chloride may be created. On interaction with water, hydrochloric acid is formed.