A recent letter [1] proposed changing the dimensionless status of the radian and steradian within the SI, while allowing the continued use of the convention to set the angle 1 radian equal to the number 1 within equations, providing this is done explicitly. This would bring the advantages of a physics-based, consistent, and logically-robust unit system, with unambiguous units for all physical quantities, for the first time, while any upheaval to familiar equations and routine practice would be minimised. More details of this proposal are given here. The only notable changes for typical end-users would be: improved units for the quantities torque, angular momentum and moment of inertia; a statement of the convention accompanying some familiar equations; and the use of different symbols for ℏ the action and ℏ the angular momentum, a small step forward for quantum physics. Some features of the proposal are already established practice for quantities involving the steradian such as radiant intensity and radiance.

最近的一封信 [1] 提议改变 SI 中弧度和球面度的无量纲状态，同时允许继续使用约定将角度 1 弧度设置为等于方程中的数字 1，前提是要明确这样做。这将首次带来基于物理学、一致且逻辑稳健的单位系统的优势，所有物理量都有明确的单位，而对熟悉的方程和常规实践的任何剧变都将被最小化。此处提供了该提案的更多详细信息。对于典型的最终用户来说，唯一显着的变化是： 改进了扭矩、角动量和转动惯量的单位；附有一些熟悉的方程式的公约声明；以及使用不同的符号表示ℏ动作和ℏ角动量，量子物理学向前迈进了一小步。该提案的一些特征已经是涉及球面度的量的既定做法，例如辐射强度和辐射度。