This article summarizes
equation
In mathematics, an equation is a formula that expresses the equality of two expressions, by connecting them with the equals sign . The word ''equation'' and its cognates in other languages may have subtly different meanings; for example, in ...
s in the theory of
fluid mechanics
Fluid mechanics is the branch of physics concerned with the mechanics of fluids ( liquids, gases, and plasmas) and the forces on them.
It has applications in a wide range of disciplines, including mechanical, aerospace, civil, chemical and bio ...
.
Definitions
Here
is a
unit vector
In mathematics, a unit vector in a normed vector space is a vector (often a spatial vector) of length 1. A unit vector is often denoted by a lowercase letter with a circumflex, or "hat", as in \hat (pronounced "v-hat").
The term ''direction vecto ...
in the direction of the flow/current/flux.
Equations
See also
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Defining equation (physical chemistry)
In physical chemistry, there are numerous quantities associated with chemical compounds and reactions; notably in terms of ''amounts'' of substance, ''activity'' or ''concentration'' of a substance, and the ''rate'' of reaction. This article uses ...
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List of electromagnetism equations
This article summarizes equations in the theory of electromagnetism.
Definitions
Here subscripts ''e'' and ''m'' are used to differ between electric and magnetic charges. The definitions for monopoles are of theoretical interest, although rea ...
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List of equations in classical mechanics
Classical mechanics is the branch of physics used to describe the motion of macroscopic objects. It is the most familiar of the theories of physics. The concepts it covers, such as mass, acceleration, and force, are commonly used and known. The sub ...
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List of equations in gravitation
This article summarizes equations in the theory of gravitation.
Definitions
Gravitational mass and inertia
A common misconception occurs between centre of mass and centre of gravity. They are defined in similar ways but are not exactly the ...
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List of equations in nuclear and particle physics
This article summarizes equations in the theory of nuclear physics and particle physics.
Definitions
Equations
Nuclear structure
Nuclear decay
Nuclear scattering theory
The following apply for the nuclear reaction:
:''a'' + ''b'' ↠...
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List of equations in quantum mechanics
This article summarizes equations in the theory of quantum mechanics.
Wavefunctions
A fundamental physical constant occurring in quantum mechanics is the Planck constant, ''h''. A common abbreviation is , also known as the ''reduced Planck co ...
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List of photonics equations
This article summarizes equations used in optics, including geometric optics, physical optics, radiometry, diffraction, and interferometry.
Definitions
Geometric optics (luminal rays)
General fundamental quantities
Physical optics (EM lum ...
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List of relativistic equations
Following is a list of the frequently occurring equations in the theory of special relativity.
Postulates of Special Relativity
To derive the equations of special relativity, one must start with two other
#The laws of physics are invariant ...
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Table of thermodynamic equations
This article is a summary of common equations and quantities in thermodynamics (see thermodynamic equations for more elaboration).
Definitions
Many of the definitions below are also used in the thermodynamics of chemical reactions.
General ...
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