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Which of the following is not a unit of pressure measurement?
1. Psi
2. mm of Hg
3. Bar
4. N/m

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Correct Answer - Option 4 : N/m
  • The pressure is the force exerted perpendicular to the surface of an object per unit area over which the force is spread.
  • For pressure, the SI system's basic unit is Pascal (Pa), which is N/m² (One Newton per square meter, while Newton is kg m/s²).
  • Pascal is a very small pressure unit. For example, the standard atmospheric pressure is 101325 Pa absolute.
  • The most frequently used units of pressure are pascal (Pa), kilopascal (kPa), megapascal (MPa), psi (pound per square inch), torr (mmHg), atm (atmospheric pressure), and bar.

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