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ERIC Number: EJ930488
Record Type: Journal
Publication Date: 2010-Jul
Pages: 6
Abstractor: As Provided
Reference Count: 16
ISSN: ISSN-0031-9120
The Pulley Analogy Does Not Work for Every Siphon
Planinsic, Gorazd; Slisko, Josip
Physics Education, v45 n4 p356-361 Jul 2010
How do siphons work? Some see atmospheric pressure, explicitly or implicitly, as a crucial factor in siphon action. Others explain that a siphon works due to a difference of water weights in unequal arms. According to the latter view, siphon action is analogous to the action of a pulley or to the behaviour of a chain that is moving over a tube. In this article, we show that a siphon made from non-uniform tubing disproves the validity of the pulley analogy. Our pedagogical experiments were inspired by the critique that Hero formulated many years ago. (Contains 7 figures.)
Institute of Physics Publishing. The Public Ledger Building Suite 929, 150 South Independence Mall West, Philadelphia, PA 19106. Tel: 215-627-0880; Fax: 215-627-0879; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A