Conversions can be done either with the "->" conversion operator or with the equivalent "convert" function. The function has three parameters: a quantity, a unit to convert from and a unit to convert to. Likewise the conversion operator uses three values: the quantity and unit to convert from are placed on the left side of the operator while the unit to convert to goes to the right side.
The basic unit of angular speed is the "radian / second". All units of angular speed are expressed in terms of this base unit and so measurements can be converted from any one of the following units to any other.
10 radPS -> rpm = 95.492966
convert(10; radPS; rpm) = 95.492966
10 radPS -> rps = 1.5915494
convert(10; radPS; rps) = 1.5915494
10 rpm -> radPS = 1.0471976
convert(10; rpm; radPS) = 1.0471976
10 rpm -> rrps = 0.1666667
convert(10; rpm; rps) = 0.1666667
10 rps -> radPS = 62.831853
convert(10; rps; radPS) = 62.831853
10 rps -> rpm = 600
convert(10; rps; rpm) = 600