A radiation-force-floor scan lowers irradiance or illuminated area across three rows, showing when F = p * A falls below the stated force floor. The arithmetic is exact only for the stated pressures, areas, force floor, and rows in the ideal uniform-beam, flat-surface model. Real measurements add beam profile, alignment, reflectivity/absorption, detector calibration, timing/area calibration, surface geometry, finite precision, and uncertainty.
Illuminated area is scanned below, at, and above a force floor. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Illuminated area is scanned against a force floor
Pressure stays 1 Pa while illuminated area is 2 square meters. The asserted pressure-area product gives 2 N which is below the 3 N floor.
F=pA=1⋅2m2=2N
Illuminated area is scanned against a force floor
Pressure stays 1 Pa while illuminated area is 3 square meters. The asserted pressure-area product gives 3 N which is at the 3 N floor.
F=pA=1⋅3m2=3N
Illuminated area is scanned against a force floor
Pressure stays 1 Pa while illuminated area is 4 square meters. The asserted pressure-area product gives 4 N which is above the 3 N floor.