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In physics, a fluid is defined as a substance, such as a liquid or gas, that continuously deforms and flows under an applied shear stress. Fluids lack a shear modulus and are characterized by their inability to support shear stress in static equilibrium, distinguishing them from solids. They can be classified based on their compressibility and their relationship between shear stress and strain rate, such as Newtonian or non-Newtonian fluids. Mathematical models like the Navier-Stokes equations are used to describe their behavior.
In biological and medical contexts, the term fluid refers specifically to the liquid constituents of an organism, known as body fluids or biofluids. These are categorized into various compartments, including intracellular and extracellular spaces, with extracellular fluid further divided into interstitial, intravascular, and transcellular volumes. In healthy adults, total body water typically constitutes 52% to 67% of body weight, depending on factors such as sex and body fat percentage.
Fluids are substances that cannot resist shear forces and continuously deform under external stress.
The behavior of fluids is governed by the Navier-Stokes equations, which account for the conservation of mass, momentum, and energy.
Total body water in humans is divided into intracellular and extracellular compartments, with the latter including blood plasma and interstitial fluid.
Fluids can be classified as compressible or incompressible, and as Newtonian or non-Newtonian based on their stress-strain relationship.
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.
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