$$ f $$ Unit $$ \mathrm{Hz} = \frac{ 1 }{ \mathrm{s} } $$

Frequency indicates the number of revolutions per time unit. The frequency is the reciprocal of the period \(T\). Consequently, the angular frequency can also be expressed using the period:$$ \omega ~=~ \frac{2\pi}{T} $$

Pi

$$ \pi $$ Unit $$ - $$

Pi is a mathematical constant and has the value \( \pi ~=~ 3.1415926... \). In this case, it is used to specify the angle in radians. Here \(2\pi\) is a complete revolution (360 degrees in degree measure).

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