Correct Answer:
D. Pressure
The unit Nm⁻² stands for Newtons per square meter (N/m²). This is the International System of Units (SI) unit for pressure. Pressure is fundamentally defined as force distributed perpendicularly over a given area. The Newton (N) is the SI unit for force, and the square meter (m²) is the SI unit for area. Therefore, N/m² precisely quantifies the amount of force exerted per unit area. This unit is also commonly known as the Pascal (Pa), where 1 Pa = 1 N/m². Understanding this relationship is crucial in physics and engineering for calculating forces exerted by fluids or objects on surfaces.
- The SI unit for Energy is the Joule (J).
- The SI unit for Work is also the Joule (J), as work is a form of energy transfer.
- The SI unit for Density is kilograms per cubic meter (kg/m³), which represents mass per unit volume.