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(B) The unit of force per unit area is $N/m^2$ or Pascal $(Pa)$.Stress is defined as the restoring force per unit area,so it has the unit $N/m^2$.Pres

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Strain

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(B) The unit of force per unit area is $N/m^2$ or Pascal $(Pa)$.Stress is defined as the restoring force per unit area,so it has the unit $N/m^2$.Pressure is defined as the thrust force per unit area,so it has the unit $N/m^2$.Young's modulus of elasticity is defined as the ratio of stress to strain. Since strain is dimensionless,the unit of Young's modulus is the same as stress,which is $N/m^2$.Strain is defined as the ratio of change in dimension to the original dimension. Since it is a ratio of two similar quantities,it is a dimensionless and unitless quantity.Therefore,the correct option is $(B)$.

Which one of the following quantities does not have the unit of force per unit area?

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