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Fluid mechanics is the physics branch studying liquids, gases and plasmas, their response to forces, and core properties like density and viscosity.
Fluid mechanics, the branch of physics that examines how liquids, gases and plasmas react to forces, underpins engineering, weather forecasting and many other fields [1].
| At a glance | |
|---|---|
| Definition | Study of fluid response to forces |
| Main branches | Fluid statics (rest) and fluid dynamics (motion) |
| Core properties | Density, viscosity, surface tension, buoyancy |
| Historical roots | Archimedes’ buoyancy principle (c. 250 BC) |
Fluid mechanics covers both fluids at rest (hydrostatics) and in motion (fluid dynamics). It treats fluids as continuous media, ignoring atomic structure, which allows macroscopic modeling of pressure, flow and forces [2]. Key properties include density (mass per unit volume), viscosity (internal friction between layers), surface tension (elastic‑like behavior of liquid surfaces) and buoyancy (upward force equal to displaced fluid weight) [1].
The discipline traces back to Archimedes’ work on buoyancy and was later expanded by Leonardo da Vinci, Torricelli, Newton, Pascal and Bernoulli, among others [2]. In the 19th century, Stokes and Thomson (Lord Kelvin) refined the Navier–Stokes equations, while Ludwig Prandtl’s 1904 boundary‑layer concept resolved early drag‑force puzzles [1]. Today, fluid mechanics informs aircraft wing design, weather modeling, ocean‑current analysis and computational fluid dynamics (CFD) simulations [1].
Understanding fluid mechanics remains essential for advancing aerospace, climate science and many engineering sectors, as its core equations continue to challenge researchers and drive technological innovation.
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A fluid lacks a shear modulus and cannot resist shear stress, whereas a solid responds to shear stress with a restoring force or requires initial stress to deform.
Total body water is divided into intracellular fluid (about two-thirds) and extracellular fluid (about one-third), with the extracellular portion further split between interstitial and intravascular spaces.
No, the term fluid in physics encompasses both liquids and gases, while in medicine it refers specifically to liquid constituents of the body.