Used in medical imaging, particularly in X-ray diagnostics of the gastrointestinal tract. The solution is ingested or administered as an enema, allowing clear visualization of the esophagus, stomach, and intestines due to its high density, which blocks X-rays and enhances contrast. Also employed in industrial applications such as radiography of metal parts and in some drilling fluids for oil and gas wells. In laboratory settings, it serves as a reagent for sulfate detection, forming a characteristic precipitate.