Classical fluids, as a physical system, are collections of particles (atoms or molecules) whose macroscopic behavior is accurately described by classical mechanics and continuum hypotheses, neglecting quantum and relativistic effects. They are modeled by fields such as velocity, pressure, and density that satisfy the Navier–Stokes or Euler equations, depending on viscosity. Classical fluids encompass both liquids and gases in regimes where mean free paths and de Broglie wavelengths are small compared with system scales, enabling thermodynamic and hydrodynamic descriptions, including transport phenomena (viscosity, thermal conductivity, diffusion) and flow regimes characterized by dimensionless numbers like Reynolds and Mach numbers.
Water molecules do not simply swirl around in complete disorder; they can form certain preferred structures. This scientific fact is often presented in entirely unscientific ways. For example, when people speak of an alleged ...
General Physics
May 18, 2026
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In physics, the mesoscale lies between the microscopic and the macroscopic. It is not just the domain of tiny living creatures like small larvae, shrimp, and jellyfish, but also where physics equations become extreme. While ...
General Physics
Mar 8, 2026
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Researchers at the University of Bayreuth have developed a method using artificial intelligence that can significantly speed up the calculation of liquid properties. The AI approach predicts the chemical potential—an indispensable ...
Soft Matter
Feb 11, 2026
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Several years ago, scientists discovered that a single microscopic particle could rock back and forth on its own under a steady electric field. The result was curious, but lonely. Now, Northwestern University engineers have ...
Soft Matter
Jan 26, 2026
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Researchers have discovered that not all atoms in a liquid are in motion and that some remain stationary regardless of the temperature, significantly impacting the solidification process, including the formation of an unusual ...
Nanophysics
Dec 9, 2025
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A supercritical fluid refers to a state in which the temperature and pressure of a substance exceed its critical point, where no distinction exists between liquid and gas phases. Traditionally, it has been regarded as a single, ...
General Physics
Oct 2, 2025
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We rarely think about how liquids flow—why honey is thick, water is thin or how molten plastic moves through machines. But for scientists and engineers, understanding and predicting the viscosity of materials, especially ...
An international research collaboration featuring scientists from the FAMU-FSU College of Engineering and the National High Magnetic Field Laboratory has discovered a fundamental universal principle that governs how microscopic ...
Soft Matter
Jun 4, 2025
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170
Lacquers, paint, concrete—and even ketchup or orange juice: Suspensions are widespread in industry and everyday life. By a suspension, materials scientists mean a liquid in which tiny, insoluble solid particles are evenly ...
Soft Matter
Apr 7, 2025
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Researchers at the Department of Energy's Oak Ridge National Laboratory have tested a quantum computing approach to an old challenge: solving classical fluid dynamics problems.
Soft Matter
Mar 25, 2025
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