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 entropy is the Joule per Kelvin. All units of entropy 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 jpk -> btuPF = 0.0052657
convert(10; jpk; btuPF) = 0.0052657
10 jpk -> clausius = 0.0023885
convert(10; jpk; clausius) = 0.0023885
10 btuPF -> jpk = 18,991.005
convert(10; btuPF; jpk) = 18,991.005
10 clausius -> jpk = 41,868
convert(10; clausius; jpk) = 41,868
10 clausius -> btuPF = 22.046226
convert(10; clausius; btuPF) = 22.046226
10 btuPF -> clausius = 4.5359237
convert(10; btuPF; clausius) = 4.5359237