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A sphere of radius r has surface area 4πr 2.. The surface area (symbol A) of a solid object is a measure of the total area that the surface of the object occupies. [1] The mathematical definition of surface area in the presence of curved surfaces is considerably more involved than the definition of arc length of one-dimensional curves, or of the surface area for polyhedra (i.e., objects with ...
Impervious surface percentage in various cities. The percentage imperviousness, commonly referred to as PIMP in calculations, is an important factor when considering drainage of water. It is calculated by measuring the percentage of a catchment area which is made up of impervious surfaces such as roads, roofs and other paved surfaces.
Molecular surface may refer to one of the following. The Van der Waals surface; Accessible surface area or Connolly surface; Any of isosurfaces for a molecule
Scratches, represented by triangular-shaped grooves, make the surface area greater. Specific surface area (SSA) is a property of solids defined as the total surface area (SA) of a material per unit mass, [1] (with units of m 2 /kg or m 2 /g). Alternatively, it may be defined as SA per solid or bulk volume [2] [3] (units of m 2 /m 3 or m −1).
Cassie's law takes on special meaning when the heterogeneous surface is a porous medium. σ 1 {\displaystyle \sigma _{1}} now represents the solid surface area and σ 2 {\displaystyle \sigma _{2}} air gaps, such that the surface is no longer completely wet.
On the sphere, he showed that the surface area is four times the area of its great circle. In modern terms, this means that the surface area is equal to: =. The result for the volume of the contained ball stated that it is two-thirds the volume of a circumscribed cylinder, meaning that the volume is
The main factor of this model is the contact line density, Λ, which is the total perimeter of asperities over a given unit area. Sample hydrophobic surface composed of square pillars. Λ = 4x/y 2. The critical contact line density Λ C is a function of body and surface forces, as well as the projected area of the droplet.
The surface area and the volume of the truncated icosahedron of edge length are: [2] = (+ +) = +. The sphericity of a polyhedron describes how closely a polyhedron resembles a sphere. It can be defined as the ratio of the surface area of a sphere with the same volume to the polyhedron's surface area, from which the value is between 0 and 1.
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