Sphericity is a measure of how closely the shape of an object resembles that of a perfect sphere. For example, the sphericity of the balls inside a ball bearing determines the quality of the bearing, such as the load it can bear or the speed at which it can turn without failing. Sphericity is a specific example of a compactness measure of a shape. Defined by Wadell in 1935, the sphericity, , of a particle is the ratio of the surface area of a sphere with the same volume as the given particle to the surface area of the particle:
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| - Sphärizität (Geologie) (de)
- 구형성 (ko)
- Sfericiteit (geologie) (nl)
- Sphericity (en)
- Сферичность (ru)
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| - In der Geologie ist Sphärizität eine Kenngröße dafür, wie kugelförmig ein Körper ist. (de)
- 구형성(球形性, 영어: Sphericity)은 어떤 물체의 모양이 구와 얼마나 닮았는지를 나타내는 지표다. 예를 들어, 베어링에 들어가는 베어링 볼의 구형도는 베어링 볼의 품질을 결정한다. 1935년, 헤이컨 워들(Hakon Wadell)에 의해 처음으로 정의되었으며, 구형도 는 물체와 동일한 부피를 가지는 구의 겉넓이를 물체의 겉넓이로 나눈 값이다. 물체 의 겉넓이를 , 부피를 라고 할 때, 로 정의하며, 1보다 클 수 없다. (ko)
- Сфери́чность — количественная мера того, насколько сферическим (круглым) является объект. Определённая Х. Уоделлом (H. Wadell) в 1935 году сферичность частицы представляет собой отношение площади поверхности сферы (того же объёма, что и данная частица) к площади поверхности частицы: где равно объёму частицы и равно площади поверхности частицы. Сферичность сферы равна единице по определению, а вследствие изопериметрического неравенства сферичность любого другого тела меньше единицы. (ru)
- Sphericity is a measure of how closely the shape of an object resembles that of a perfect sphere. For example, the sphericity of the balls inside a ball bearing determines the quality of the bearing, such as the load it can bear or the speed at which it can turn without failing. Sphericity is a specific example of a compactness measure of a shape. Defined by Wadell in 1935, the sphericity, , of a particle is the ratio of the surface area of a sphere with the same volume as the given particle to the surface area of the particle: (en)
- Sfericiteit is een maat waarmee kan worden aangegeven hoe sterk een voorwerp een sfeervorm benadert, oftewel hoe rond het voorwerp is. De sfericiteit wordt in de geologie gebruikt om de vorm van klasten (deeltjes) in sedimentair gesteente te beschrijven. De sfericiteit wordt beschreven als de verhouding tussen het oppervlak van het voorwerp en het oppervlak van een sfeer met hetzelfde volume als het voorwerp: Waarin de sfericiteit is, het volume van het voorwerp en de oppervlakte van het voorwerp. (nl)
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| - In der Geologie ist Sphärizität eine Kenngröße dafür, wie kugelförmig ein Körper ist. (de)
- Sphericity is a measure of how closely the shape of an object resembles that of a perfect sphere. For example, the sphericity of the balls inside a ball bearing determines the quality of the bearing, such as the load it can bear or the speed at which it can turn without failing. Sphericity is a specific example of a compactness measure of a shape. Defined by Wadell in 1935, the sphericity, , of a particle is the ratio of the surface area of a sphere with the same volume as the given particle to the surface area of the particle: where is volume of the particle and is the surface area of the particle. The sphericity of a sphere is unity by definition and, by the isoperimetric inequality, any particle which is not a sphere will have sphericity less than 1. Sphericity applies in three dimensions; its analogue in two dimensions, such as the cross sectional circles along a cylindrical object such as a shaft, is called roundness. (en)
- 구형성(球形性, 영어: Sphericity)은 어떤 물체의 모양이 구와 얼마나 닮았는지를 나타내는 지표다. 예를 들어, 베어링에 들어가는 베어링 볼의 구형도는 베어링 볼의 품질을 결정한다. 1935년, 헤이컨 워들(Hakon Wadell)에 의해 처음으로 정의되었으며, 구형도 는 물체와 동일한 부피를 가지는 구의 겉넓이를 물체의 겉넓이로 나눈 값이다. 물체 의 겉넓이를 , 부피를 라고 할 때, 로 정의하며, 1보다 클 수 없다. (ko)
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