The quality or state of having equal density throughout or between different substances.
From Latin 'aequus' (equal) + 'densitas' (density). This noun form abstracts the concept into a measurable property.
In astrophysics, finding regions of equidensity helps scientists understand how materials distribute in stars and planets—the Sun's core and the deepest ocean trenches have very different equidensity zones that reveal their physical conditions.
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