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The area density (also known as areal density, surface density, superficial density, column density, or density thickness) of a two-dimensional object is defined as the quotient of mass by area. The SI derived unit is the "kilogram per square metre" (unit symbol kg·m−2).
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density area mass per square unit also displaystyle quantity column rho defined quotient grams related surface paper areic path int
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Area density | Common symbols | ρ A {\displaystyle \rho _{A}} | 1.00 | infobox |
| Area density | Derivations from other quantities | ρ A = m A {\displaystyle \rho _{A}={\frac {m}{A}}} | 1.00 | infobox |
| Area density | Derivations from other quantities | ρ A = ρ l {\displaystyle \rho _{A}=\rho l} | 1.00 | infobox |
| Area density | Dimension | L − 2 M {\displaystyle {\mathsf {L}}^{-2}{\mathsf {M}}} | 1.00 | infobox |
| Area density | In SI base units | m−2⋅kg | 1.00 | infobox |
| Area density | SI unit | kg/m2 | 1.00 | infobox |
| hard disk drives | instance of | Data storage mediaAreal density is used to quantify and compare different types media used in data storage devices | 0.80 | text |
| optical disc drives | instance of | Data storage mediaAreal density is used to quantify and compare different types media used in data storage devices | 0.80 | text |
| tape drives | instance of | Data storage mediaAreal density is used to quantify and compare different types media used in data storage devices | 0.80 | text |
| Area density | related to Astronomy | In | 0.60 | section |
| Area density | related to Astronomy | Also | 0.60 | section |
| Area density | related to Astronomy | H2 | 0.60 | section |
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