The complete operational definition of physical law in three lines.

The complete operational definition of physical law in three lines:

1. Remove input units — cancel the arbitrary human unit standards from the measured quantities (e.g., divide by the non reduced Planck Jacobians. 
   
   
2. Do the physics as a pure ratio — work with dimensionless ratios only. This is the only step that involves the eternal, unit‑free relationships.
   
   
3. Decorate with output units — multiply by the appropriate Planck Jacobians (or any chosen unit standards) to express the result in human‑readable units.

Step 2 is the only physics. Steps 1 and 3 are pure accounting — converting between the dimensionless reality and our arbitrary measurement conventions.