Acids are corrosives chemicals that cause visible destruction of, or irreversible alternations in, living tissue by chemical action at the site of contact. Corrosive effects can occur not only to the skin and eyes, but also to the respiratory tract through inhalation and to the gastrointestinal tract through ingestion. Acids have a high potential to cause external injury to the body. Acid fumes can damage tissue by dissolving rapidly in moisture on the skin or within the respiratory tract when inhaled.