Sphere

$An image of one of the most accurate human-made spheres, as it refracts the image of Einstein in the background. This sphere was a fused quartz gyroscope for the Gravity Probe B experiment, and differs in shape from a perfect sphere by no more than 40 atoms (less than 10 nanometers) of thickness. It was announced on 1 July 2008 that Australian scientists had created even more nearly perfect spheres, accurate to 0.3 nanometers, as part of an international hunt to find a new global standard kilogram.[5]$

A sphere (from Greek σφαῖρα — sphaira, "globe, ball") is a perfectly round geometrical object in three-dimensional space that is the surface of a completely round ball, (viz., analogous to a circular object in two dimensions). Like a circle, which geometrically is a two-dimensional object, a sphere is defined mathematically as the set of points that are all at the same distance $r$ from a given point, but in three-dimensional space. This distance $r$ is the radius of the ball, and the given point is the center of the mathematical ball. The longest straight line through the ball, connecting two points of the sphere, passes through the center and its length is thus twice the radius; it is a diameter of the ball.

单词	Spherical surface
释义	Spherical surface 英语例句库 A non-wrinkling limited graph for spherical surface parts of retiary metal sheet and metal sheet is obtained. 通过模拟得到了带孔网板和无孔板成形球面件时不起皱成形极限与板厚的关系曲线。原声例句玩转物理学 The integral of dA is A; the area of the concentric spherical surface. dA的积分是A;同心球面的面积。玩转物理学 So, the electric flux is independent of the radius of the concentric spherical surface? 那么，电通量与同心球面半径无关吗？玩转物理学 Actually, the electric field has the same magnitude as it passes through every infinitesimally small area, dA, on the concentric, spherical surface through which we are finding the flux. 实际上，当电场穿过我们正在寻找通量的同心球面上的每个无穷小区域 dA 时，它具有相同的幅度。玩转物理学 In the example we just did, capital Q is the charge of the point charge, and it is the charge enclosed inside an imaginary spherical surface and the imaginary spherical surface is called a Gaussian surface. 在我们刚才做的例子中，大写 Q 是点电荷的电荷，它是被包裹在一个假想球面内的电荷，这个假想球面称为高斯曲面。英语百科 Sphere $An image of one of the most accurate human-made spheres, as it refracts the image of Einstein in the background. This sphere was a fused quartz gyroscope for the Gravity Probe B experiment, and differs in shape from a perfect sphere by no more than 40 atoms (less than 10 nanometers) of thickness. It was announced on 1 July 2008 that Australian scientists had created even more nearly perfect spheres, accurate to 0.3 nanometers, as part of an international hunt to find a new global standard kilogram.[5]$ A sphere (from Greek σφαῖρα — sphaira, "globe, ball") is a perfectly round geometrical object in three-dimensional space that is the surface of a completely round ball, (viz., analogous to a circular object in two dimensions). Like a circle, which geometrically is a two-dimensional object, a sphere is defined mathematically as the set of points that are all at the same distance $r$ from a given point, but in three-dimensional space. This distance $r$ is the radius of the ball, and the given point is the center of the mathematical ball. The longest straight line through the ball, connecting two points of the sphere, passes through the center and its length is thus twice the radius; it is a diameter of the ball.
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Spherical surface

Sphere