的意思 steradian

1. The steradian is the SI unit of solid angle, representing the portion of a sphere that a cone covers.
立体角是固定角的SI单位，代表圆锥覆盖的球体部分。

2. The steradian is defined as the solid angle subtended at the center of a sphere by a portion of the surface equal in area to the square of the sphere's radius.
立体角定义为球心处的固体角，由表面部分构成，面积等于球体半径的平方。

3. One steradian is equal to the solid angle subtended at the center of a sphere by a surface area of one square meter.
一个立体角等于球心处由一平方米表面构成的固体角。

4. The steradian is a dimensionless unit, as it is defined as the ratio of the area of a portion of a sphere's surface to the square of its radius.
立体角是一个无量纲单位，因为它被定义为球体表面部分面积与半径平方的比例。

5. The steradian is a useful concept in the study of optics, as it helps quantify the amount of light emitted or received by a surface.
立体角是光学研究中一个有用的概念，因为它帮助量化表面发射或接收的光量。

6. Engineers and physicists often use steradians to calculate the intensity of radiation emitted by a source in a specific direction.
工程师和物理学家通常使用立体角来计算源头在特定方向上发射的辐射强度。