# Area

From open-encyclopedia.com - the free encyclopedia.

*This article explains the meaning of area as a Physical quantity. Article area (geometry) is more mathematical.*

**Area** is a quantity expressing the size of a region of space. **Surface area** refers to the summation of the areas of the exposed sides of an object.

## Units

Units for measuring surface area include:

- square metre - SI derived unit
- are - 100 square metres
- hectare - 10,000 square metres
- square kilometre - 1,000,000 square metres
- square megametre - 10
^{12}square metres

Imperial units, as currently defined from the metre:

- square foot (plural square feet) - 0.09290304 square metres.
- square yard - 9 square feet - 0.83612736 square metres
- square perch - 30.25 square yards - 25.2928526 square metres
- acre - 160 square perches or 43,560 square feet - 4046.8564224 square metres
- square mile - 640 acres - 2.5899881103 square kilometres

The article Orders of magnitude links to lists of objects of comparable surface area.

## Cross sectional area of electrical wire

Rough figures for the cross sectional area of copper conductor:

CSA (mm²) diameter (mm) current (A) 1.0 2.8 13 1.5 3.5 17 2.5 4.2 24 4.0 4.8 32 6.0 5.4 41 10.0 6.8 55 16.0 8.0 74 25.0 9.8 97

## External link

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