Pressure Force Area
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Pressure is force distributed over an area, measured in pascals (newtons per square meter) in SI units, so the same force spread over a larger area produces lower pressure, and concentrated over a smaller area produces higher pressure. This is the physical reason a sharp knife cuts more easily than a dull one with the same applied force — the sharp edge concentrates force over much less area.

For a fixed weight (force), spreading contact over a wider area directly lowers the pressure exerted at any point, per P = F/A — this is exactly why snowshoes let a person walk on soft snow without sinking, since the same body weight is distributed over a much larger footprint. A narrow heel, by contrast, concentrates the same weight onto a tiny area, producing surprisingly high localized pressure.

Pressure itself is a scalar — it has magnitude but no specific direction — even though the force it produces on a surface always acts perpendicular to that surface. This distinguishes pressure from force, which is a vector with both magnitude and direction.

These are just different unit systems that emerged from different measurement traditions — psi (pounds per square inch) is common in the US, pascals are the SI standard, and bar and atmosphere are common in meteorology and general science — but they all measure the same underlying force-per-area quantity and convert directly into each other. Which one shows up depends on the country and industry, not on any difference in the physics.

Mixing units is the most common error — entering area in square centimeters while force is in newtons (expecting pascals) without converting consistently produces a result off by orders of magnitude. Always confirm that force, area, and the resulting pressure unit are all from the same consistent system (all SI, for instance) before trusting the number.