- Standard atmospheric pressure is defined as the pressure that supports a column of mercury exactly 760 millimeters (or 76 cm or 29.92 inches) high at 0 °C at sea level and standard gravitational acceleration. - This pressure is internationally defined as 1 standard atmosphere (atm). - 1 atm is equivalent to 101,325 Pascals (Pa), which is the SI unit of pressure. - 1 bar is another unit of pressure, equal to 100,000 Pa, which is slightly less than 1 atm. - Pascal is the SI unit of pressure (N/m²). - Poise is a unit of dynamic viscosity.
The pressure exerted by a 760 mm column of mercury at 0 °C is known as
Asked in UPSC CDS 2 2016 · Topic: Measurement/Unit (Non-SI Units (e.g., Astronomical Unit, Light-Year, Electron-Volt))
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