C.39.RO:5.3 - Retain a physical condition when reusing a dispensing operation

A dispenser supplied 50 millilitres during a 2.5-second open interval. A proposed reusable operation would dispense a requested volume V by opening for V/20 seconds.

A subject model can justify that operation under a constant flow of 20 millilitres per second over the chosen interval, with the opening and closing effects already accounted for. Under that model, a request for 80 millilitres gives 4 seconds.

Suppose the receiving setup instead has a stated constant flow of 10 millilitres per second. Keeping the old four-second action would supply 40 millilitres. Exposing flow q as an input repairs the construction to duration V/q, for positive q under the stated constant-flow conditions; 80 millilitres then takes 8 seconds.

When flow changes during discharge, V/q with an unqualified constant no longer supplies the volume-duration relation. C.16.MR can construct the measurement relation, and A.3.3.TR can supply the changing-state account. The useful outcome here may be the identified missing relation and continued use of the earlier operation where its original conditions hold.

The numerical cases instantiate supplied models. The single 50-millilitre observation itself supports that observed outcome; a repeatability claim for the real apparatus needs its corresponding physical basis.