Why Finnish Sauna Threshold Protocols Enforce Humidity-Gradient Boundary Conditions Through Door-Opening Duration and Steam-Release Cycles

芬兰桑拿门限规程为何通过开门时长与蒸汽释放周期强制执行湿度梯度边界条件

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Finnish sauna culture enforces strict door-opening protocols not for tradition’s sake but to maintain precise humidity-gradient boundary conditions essential for physiological thermoregulation.
Each entry-exit cycle is timed to 7–9 seconds—calibrated to prevent dew-point disruption in the 80–100°C air layer adjacent to the löyly stove’s stone mass.

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