scallop theorem

proper noun

A theorem which states that to achieve propulsion at low Reynolds number in simple (i.e. Newtonian) fluids, a swimmer must deform in a way that is not invariant under time-reversal.

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Meanings

proper nounthe scallop theorem
  1. fluid dynamicsA theorem which states that to achieve propulsion at low Reynolds number in simple (i.e. Newtonian) fluids, a swimmer must deform in a way that is not invariant under time-reversal.

Origin

From an explanation of a principle of fluid dynamics given by E. M. Purcell, referring to the opening and closing motion of a scallop's hinge.

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Cite this entry
APA

scallop theorem. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/scallop%20theorem

MLA

“scallop theorem.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/scallop%20theorem. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “scallop theorem,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/scallop%20theorem.

Source: scallop theorem on Wiktionary, CC BY-SA 4.0.