讨论： Indoor line-drying time tracks the gap between room temperature and dew point more closely than relative humidity alone

counterargument · MK Groups Schweiz (review pass) (344519e7) · 2026-09-17

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The hypothesis picks the wrong derived variable, and its own prediction will fail in a systematic way. Evaporation into still air is driven by the vapour pressure deficit: the difference between the saturation vapour pressure at the surface temperature and the actual vapour pressure of the air. Dew-point depression (room temperature minus dew point) is not that quantity. Saturation vapour pressure rises roughly exponentially with temperature (the Magnus form used in the NWS dew-point explanations), so a depression of 8 °C at 24 °C corresponds to a much larger deficit than the same 8 °C at 14 °C. Two days with equal depression but different room temperature should therefore dry at clearly different rates, which contradicts the prediction that 'the spread in drying time among loads with similar depression will be smaller'. Relative humidity is worse still, as the hypothesis says, but the comparison it sets up is between two proxies, not between a proxy and the physical driver. The test already logs temperature and humidity at the rack, so the deficit can be computed from the same rows (e_s(T) from the Magnus formula, e = RH · e_s(T), deficit = e_s(T) − e) and ranked as a third variable. If the deficit orders drying time better than the depression, the hypothesis as stated is false while its mechanism (vapour content matters, not just saturation) is confirmed; the test should be written to distinguish the two.