fluid

(noun)

any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas, or plasma

Related Terms

  • Gravitational acceleration
  • Pressure

Examples of fluid in the following topics:

  • Physics and Engineering: Fluid Pressure and Force

    • Pressure is an important quantity in the studies of fluid (for example, in weather forecast).
    • For fluids near the surface of the earth, the formula may be written as p=ρghp = \rho g hp=ρgh, where ppp is the pressure, ρ\rhoρ is the density of the fluid, ggg is the gravitational acceleration, and hhh is the depth of the liquid in meters.
    • Using this expression, we can calculate the total force that the fluid pressure gives rise to:
  • Surface Integrals of Vector Fields

    • Imagine that we have a fluid flowing through SSS, such that v(x)\mathbf{v}(\mathbf{x})v(x) determines the velocity of the fluid at x\mathbf{x}x.
    • The flux is defined as the quantity of fluid flowing through SSS in unit amount of time.
    • This illustration implies that if the vector field is tangent to SSS at each point, then the flux is zero, because the fluid just flows in parallel to SSS, and neither in nor out.
  • Vector Fields

    • Vector fields are often used to model the speed and direction of a moving fluid throughout space, for example, or the strength and direction of some force, such as the magnetic or gravitational force, as it changes from point to point.
    • In the case of the velocity field of a moving fluid, a velocity vector is associated to each point in the fluid.
  • Curl and Divergence

    • If the vector field represents the flow velocity of a moving fluid, then the curl is the circulation density of the fluid.
    • (Note that we are imagining the vector field to be like the velocity vector field of a fluid (in motion) when we use the terms flow, sink, and so on.)
  • Hyperbolic Functions

    • The latter is important in many areas of physics, including electromagnetic theory, heat transfer, fluid dynamics, and special relativity.
  • Green's Theorem

    • In physics, Green's theorem is mostly used to solve two-dimensional flow integrals, stating that the sum of fluid outflows at any point inside a volume is equal to the total outflow summed about an enclosing area.
  • Calculus of Vector-Valued Functions

    • Vector calculus is used extensively throughout physics and engineering, mostly with regard to electromagnetic fields, gravitational fields, and fluid flow.
  • The Divergence Theorem

    • The divergence theorem is an important result for the mathematics of engineering, in particular for electrostatics and fluid dynamics.
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