Bar is a unit of which one of the following?

The bar is a metric unit of measurement for pressure [t2]. While the SI unit of pressure is the Pascal (Pa), defined as one Newton per square meter [c1][t3], the bar is widely used in meteorology and industrial applications [c3][t6]. One bar is precisely equal to 100,000 Pascals (100 kPa) [t1][t7]. It is a practical unit because 1 bar is a close approximation to the standard atmospheric pressure at sea level, which is approximately 1.01325 bar [t2][t10]. Meteorologists frequently use the millibar (mb), where 1,000 millibars equal 1 bar [c3][c5]. In contrast, the Newton is the unit of force, the Joule is the unit of energy, and the Hertz is the unit of frequency [t8]. Therefore, the bar specifically measures pressure, representing the force exerted per unit area [c1][t2].

Sources

1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 6: Pressure, Winds, Storms, and Cyclones > 6.1 Pressure > p. 82
2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > 23.1. Atmospheric Pressure > p. 304