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Fluid solution
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<p>In <a href="/facts/General_relativity/jVsoIg8X">general relativity</a>, a fluid solution is an <a href="/facts/Exact_solutions_in_general_relativity/MFb3MFaC">exact solution</a> of the <a href="/facts/Einstein_field_equation/j2rJTzW9">Einstein field equation</a> in which the gravitational field is produced entirely by the mass, momentum, and stress density of a <a href="/facts/Fluid/wLnMhBC0">fluid</a>. </p><p>In <a href="/facts/Astrophysics/krFPRWLA">astrophysics</a>, fluid solutions are often employed as stellar models, since a perfect gas can be thought of as a special case of a perfect fluid. In <a href="/facts/Physical_cosmology/ww4ChbEq">cosmology</a>, fluid solutions are often used as <a href="/facts/Cosmological_model/ww4ChbEq">cosmological models</a>. </p>