Exploring the boundary between the siphon and barometer in a hypobaric chamber
| Data(s) |
22/04/2014
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| Resumo |
Siphons have been used since ancient times, but exactly how they work is still a matter of debate. In order to elucidate the modus operandi of a siphon, a 1.5 m high siphon was set up in a hypobaric chamber to explore siphon behaviour in a low-pressure environment. When the pressure in the chamber was reduced to about 0.18 atmospheres, a curious waterfall-like feature appeared downstream from the apex of the siphon. A hypothesis is presented to explain the waterfall phenomenon. When the pressure was reduced further the siphon broke into two columns - in effect becoming two back-to-back barometers. This experiment demonstrates the role of atmospheric pressure in explaining the hydrostatic characteristics of a siphon and the role of molecular cohesion in explaining the hydrodynamic aspects. |
| Formato |
video/quicktime video/quicktime video/quicktime video/quicktime video/quicktime application/pdf |
| Identificador | |
| Publicador |
Nature Publishing Group |
| Relação |
http://eprints.qut.edu.au/70427/1/Walking_into_chamber.mov http://eprints.qut.edu.au/70427/2/Water_fall_at_40000_feet.mov http://eprints.qut.edu.au/70427/3/From_40000_to_39000_closure_of_the_waterfall.mov http://eprints.qut.edu.au/70427/4/Stopped_at_41000_feet.mov http://eprints.qut.edu.au/70427/5/Flush_siphon.mov http://eprints.qut.edu.au/70427/6/70427.pdf http://www.nature.com/srep/ DOI:10.1038/srep04741 Hughes, Stephen W. & Gurung, Som (2014) Exploring the boundary between the siphon and barometer in a hypobaric chamber. Scientific Reports, 4(4741). |
| Direitos |
This work is licensed under a Creative Commons Attribution 3.0 Unported License. The images in this article are included in the article's Creative Commons license, unless indicated otherwise in the image credit; if the image is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the image. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ |
| Fonte |
School of Chemistry, Physics & Mechanical Engineering; Institute for Future Environments; Science & Engineering Faculty |
| Palavras-Chave | #020406 Surfaces and Structural Properties of Condensed Matter #siphon #barometer #gravity #atmosphere #waterfall #cohesion #chain #vacuum #Pythagoras cup |
| Tipo |
Journal Article |
