Question:
Units of Brinell hardness Number is
Units of Brinell hardness Number is
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Hardness = Force Area. Therefore, the units must be Force units over Area units ($kg/mm^{2}$).
Updated On: Jul 4, 2026
- Kilogram-millimetre
- Kilogram per millimetre
- Kilogram-millimetre square
- Kilogram per millimetre square
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The Correct Option is D
Solution and Explanation
Step 1: Concept The Brinell hardness test measures the resistance of a material to permanent indentation by a hardened steel or carbide ball.
Step 2: Meaning The Brinell Hardness Number (BHN) is defined as the ratio of the applied load to the surface area of the resulting indentation.
Step 3: Analysis Load is typically measured in kilograms-force ($kgf$) and the surface area of the spherical cap indentation is measured in square millimetres ($mm^{2}$).
Step 4: Conclusion Thus, the unit of BHN is $kg/mm^{2}$. Final Answer: (D)
Step 2: Meaning The Brinell Hardness Number (BHN) is defined as the ratio of the applied load to the surface area of the resulting indentation.
Step 3: Analysis Load is typically measured in kilograms-force ($kgf$) and the surface area of the spherical cap indentation is measured in square millimetres ($mm^{2}$).
Step 4: Conclusion Thus, the unit of BHN is $kg/mm^{2}$. Final Answer: (D)
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