Which one of the following is *not* the unit of pressure?
pascal (Pa)
N/m²
J/m²
bar
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC CAPF – 2022
The SI unit of force is Newton (N) and the SI unit of area is square meter (m²). Therefore, N/m² is a unit of pressure.
Pascal (Pa) is the SI unit of pressure, defined as 1 Pa = 1 N/m².
Bar is a non-SI unit of pressure, widely used (1 bar = 10⁵ Pa).
Joule (J) is the unit of energy or work. J/m² represents energy per unit area. While pressure has the same dimensions as energy density (J/m³), J/m² represents pressure multiplied by distance (since J = N.m, J/m² = (N.m)/m² = N/m * m = Pressure * Distance). Therefore, J/m² is not a unit of pressure.