Why a Siphon Starts High and Stops Low

Why can a siphon start when water crosses a high bend, yet keep draining well below that starting mark? Follow priming, a liquid-filled route to a lower outlet, and the air break that resets a flush siphon. Actual experimental footage is distinguished from original explanatory models and chosen calculations. 00:00 The level falls below the starting point 00:55 Watch a real flush siphon 01:54 One level can have two histories 02:47 Uphill locally, downhill overall 03:48 Pressure along the route 04:54 Air provides the reset 05:59 A steady supply can make a cycle 07:06 A pressure limit is a different question 08:12 Read the state, not just the height Science and demonstration sources: https://lecturedemos.ph.utexas.edu/de... https://openstax.org/books/university... https://openstax.org/books/university... https://journals.plos.org/plosone/art... Moving experimental footage: Stephen Hughes and Som Gurung (2014), Exploring the boundary between a siphon and barometer in a hypobaric chamber, Scientific Reports 4, 4741. Supplementary S1 (Flush siphon) and S3 (Water fall at 40000 feet). https://doi.org/10.1038/srep04741 https://www.nature.com/articles/srep0... Licensed CC BY 3.0: https://creativecommons.org/licenses/... Changes: excerpts selected, resized/reframed, original sound removed, narration and explanatory labels added. No endorsement implied. Original Blender cutaway, route/energy/volume graphics and edit: Matter Made Clear. Models use illustrative dimensions, liquid markers and timing; no CFD or measurement of filmed flow is claimed.