2016 · Q19
The pressure exerted by a 760 mm column of mercury at 0°C is known as
General KnowledgePhysics
- A1 pascal
- B1 atmosphere
- C1 bar
- D1 poise
Explanation
By definition, the pressure of a 760 mm column of mercury at 0 °C is one standard atmosphere (1 atm = 1.013 × 10^5 Pa). The pascal is the SI unit of pressure generally, the bar is 10^5 Pa, and the poise is a unit of viscosity — none is defined by the mercury column.