Area is the quantity that expresses the extent of a two-dimensional figure or shape , or planar lamina , in the plane. Surface area is its analog on the two-dimensional surface of a three-dimensional object. Area can be understood as the amount of material with a given thickness that would be necessary to fashion a model of the shape, or the amount of paint necessary to cover the surface with a single coat. [1] It is the two-dimensional analog of the length of a curve (a one-dimensional concept) or the volume of a solid (a three-dimensional concept).

The area of a shape can be measured by comparing the shape to squares of a fixed size. [2] In the International System of Units (SI), the standard unit of area is the square metre (written as m 2 ), which is the area of a square whose sides are one metre long. [3] A shape with an area of three square metres would have the same area as three such squares. In mathematics , the unit square is defined to have area one, and the area of any other shape or surface is a dimensionless real number.

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From trevor neale of TF Warren Group on May 8, 2017:

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Is it practical to use black light to check for dirt or other foreign matter during surface preparation inspection?