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Bar (bar)

Quantity: Pressure · Category: Non-SI

The bar is a metric unit of pressure equal to exactly 100,000 pascals — roughly one atmosphere. It is widely used in meteorology, diving and tire pressure because its values stay near convenient whole numbers.

Relation to SI

1 bar = 100,000 Pa = 10⁵ Pa (exact)

Examples

  • Sea-level air pressure is about 1.013 bar.
  • Car tires are typically inflated to 2.0–2.5 bar.
  • Weather maps report pressure in millibars (1 mbar = 1 hPa).