The bar (symbol bar) is a metric unit of pressure equal to 100 kilopascals (≈0.987 atm), used worldwide to quantify force per unit area in both everyday and scientific settings; it provides a convenient, near‑atmospheric reference for applications ranging from weather forecasting and tire inflation to laboratory experiments and industrial processes, making the bar an essential standard for engineers, physicists, and technicians who need a clear, consistent measure of pressure across diverse fields.