Pressure is force per unit area, so multiplying pressure by the area it acts on recovers the total normal force on that surface. The product F = P * A is exact only when pressure is uniform over the stated area and the surface is flat and rigid. Both P and A are measured or modeled inputs, each carrying its own uncertainty.
A pressure force is checked as pressure multiplied by area. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Pressure times area gives force
Pressure 6 pascals over area 3 square metres gives force 18 newtons.
F=6×3=18N
The force is not a separate caption
The checked force label stays tied to pressure 6 and area 3.