At fixed area, pressure changes the checked force without changing the surface. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Four pascals over three square metres gives twelve newtons

Hold area at 3 square metres. Pressure 4 pascals gives force 12 newtons.

43=124\cdot3=12
Pressure force ledgerPressure over an area gives a checked force.pressureareaforce

Six pascals gives the eighteen-newton audit force

At pressure 6 pascals, the same area gives force 18 newtons. This row matches the pressure-force link used by the audit.

63=186\cdot3=18
Pressure force ledgerPressure over an area gives a checked force.pressureareaforce

Eight pascals raises the force to twenty-four newtons

Pressure 8 pascals over the same 3 square metres gives force 24 newtons. The diagram asserts area-averaged pressure only.

83=248\cdot3=24
Pressure force ledgerPressure over an area gives a checked force.pressureareaforce