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An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.

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Mayer Amschel Rothschild (1744-1855), founder of the house of Rothschild; lithograph by Friedrich Lieder, c. 1830.

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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

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perfect fluid

physics

Also known as: ideal fluid

Learn about this topic in these articles:

definition

In fluid
The simplest model, called a perfect, or ideal, fluid, is one that is unable to conduct heat or to offer drag on the walls of a tube or internal resistance to one portion flowing over another. Thus, a perfect fluid, even while flowing, cannot sustain a tangential force; that is,…
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work of Helmholtz

In Hermann von Helmholtz: Early life
…was that vortices of an ideal fluid were amazingly stable; they could collide elastically with one another, intertwine to form complex knotlike structures, and undergo tensions and compressions, all without losing their identities. In 1866 William Thomson (later Lord Kelvin) proposed that these vortices, if composed of the ether that…
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