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| | | #REDIRECT [[Source]] |
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| {{TermHeader}}
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| <div class="termentry">
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| <div class="term">
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| == source ==
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| <div class="definition"><div class="short_definition">In [[hydrodynamics]], a point, line, or area at which mass or [[energy]] is added to a system, either instantaneously or continuously.</div><br/> <div class="paragraph">Conversely, a [[sink]] is a point where mass or energy is removed from the system. An [[incompressible fluid]] will possess sources or sinks of mass only at points where the [[divergence]] of its [[velocity]] vector is nonzero; a source is associated with positive divergence and a sink with negative divergence ([[convergence]]). The fluid is usually assumed to pass outward from a source or inward to a sink equally in all directions along radial lines. The strength of a source, for example, the rate of mass flow of fluid of unit [[density]] across a curve enclosing the source, is given by <div class="display-formula"><blockquote>[[File:ams2001glos-Se40.gif|link=|center|ams2001glos-Se40]]</blockquote></div> where ''r'' is the distance from the source and ''v''<sub>''n''</sub> the radial speed.</div><br/> </div>
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| {{TermIndex}}
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| [[Category:Terms_S]]
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