Which of the following describes a unit of pressure?

The Pascal (Pa) is indeed the correct unit of pressure. It is defined as one newton per square meter (N/m²), which measures the force applied per unit area. Pressure is fundamentally concerned with how force is distributed over an area, making the Pascal a direct representation of this relationship. In practical applications, a pressure of one Pascal means that a force of one newton is exerted uniformly over an area of one square meter.

The other options represent different physical quantities: the Joule (J) is a unit of energy, the Watt (W) is a unit of power, and meters per second squared (m/s²) is a unit of acceleration. None of these units are applicable to measuring pressure, as they relate to different concepts. Thus, the Pascal stands out as the only correct choice when describing a unit of pressure.