IEVref: 113-01-42 ID: Language: en Status: Standard Term: rotational frequency Synonym1: speed of rotation [Preferred] Synonym2: Synonym3: Symbol: n Definition: magnitude of the angular velocity ω divided by the angle 2π, thus n = |ω|/2πNOTE 1 The rotational frequency is also the derivative of the absolute value of angle of rotation φ with respect to time t, divided by 2π, thus $n=\frac{1}{2\pi }\frac{\text{d}|\phi |}{\text{d}t}$. NOTE 2 The coherent SI unit of rotational frequency is second to the power minus one, s–1. The units revolution per second, symbol r/s, and revolution per minute, symbol r/min, are widely used in specifications for rotating machines. Publication date: 2011-04 Source: Replaces: Internal notes: 2017-06-02: Cleanup - Remove Attached Image 113-01-42en.gif 2017-06-02: Cleanup - Remove Attached Image 113-01-421en.gif 2017-06-02: Cleanup - Remove Attached Image 113-01-422en.gif CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: