The area of the solid particles in a given quantity of soil or porous medium (i) BET surface area is that area on which gas molecules, such as N2 or O2, can adsorb which normally does not include the planar surface of expanding clays such as smectites (ii) EGME surface area is that area on which ethylene glycol monoethyl ether can adsorb which normally includes the planar surface of expanding clays such as smectites See also specific surface
The surface area of granular activated carbon is empirically determined by the Brunauer, Emmett and Teller Method (BET Method), which utilizes the adsorption of nitrogen at liquid nitrogen temperature in the calculation Surface area is usually expressed in square meters per gram of carbon
(n) the area accupied by an object: ex the amount of carpet to cover a floor would be determined by the surface area of the floor; the sum of the areas of all the surfaces of an object
The "frontal area" of an electrode doing the primary EDM cutting Also the corresponding area of the workpiece Usually expressed in square inches (in2) in the US
The wetted area of the lake, excluding islands, in hectares at the time of the survey as calculated from a bathymetric map Most surveys include wetlands surrounding the lake, but some may not Some surveys may treat two or more small lakes as a single unit and the single surface area represents all the lakes surveyed Surveys are done at different times of the year and over many years A particular surface area measurement may have been taken during the spring runoff after a high snowfall winter or in late summer after several drought years Also, the methods of calculating surface have improved over the years
the total area in contact between two heterogeneous states of matter that are in contact Surface area increase with the subdivision of particles For example, crushing and grinding a solid will increase its surface area, as will shaking two immiscible liquids The increase of surface area on subdivision is illustrated in the following diagram