Hydrogen chloride is a colorless gas with a strong, pungent smell. When it dissolves in water, it forms hydrochloric acid, a common substance used in laboratories and industries. This acid is important for various processes, including cleaning metals and producing chemicals. In nature, hydrogen chloride can be found in volcanic gases and is also produced during the digestion process in the stomach, helping to break down food. It is essential for maintaining a healthy digestive system. However, exposure to hydrogen chloride gas can be harmful, so safety precautions are necessary when handling it in any form.