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Reference.org
Volume integral
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a> (particularly <a href="/facts/Multivariable_calculus/PEs5SgUF">multivariable calculus</a>), a volume integral (∭) is an <a href="/facts/Integral/V7lyV997">integral</a> over a <a href="/facts/Three-dimensional_space/KAqKWUbS">3-dimensional</a> domain; that is, it is a special case of <a href="/facts/Multiple_integral/Fvl3Bkam">multiple integrals</a>. Volume integrals are especially important in <a href="/facts/Physics/a7aH2y08">physics</a> for many applications, for example, to calculate <a href="/facts/Flux/Aw3P5Bvb">flux</a> densities, or to calculate mass from a corresponding density function. </p>