Main Page | See live article | Alphabetical index The bar is a metric unit of pressure, equal to one Newton per square centimeter. The preferred SI unit of pressure is the Pascal (Pa), because the Pascal is based on square meters instead of square centimeters. 1 bar is equal to 100,000 Pa. The bar is still widely used by the general public. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.