Rankine scale, conversion

For sea water, which is the principal saline water being considered for conversion, the depression of the freezing temperature is closely approximated by taking K = 52.41 for the Kelvin scale (1) or K = 94.34 for the Rankine scale. 

Perform simple temperature conversions between the Fahrenheit, Celsius, Kelvin, and Rankine scales. 

Fahrenheit or Centigrade scales. The absolute Fahrenheit scale is called Rankine and the absolute Centigrade is called Kelvin. For conversion ... 

Still other units encountered in the literature and workplace come from various other systems (absolute and otherwise). These include metric systems (c.g.s. and MKS), some of whose units overlap with SI units, and those (FPS) based on English units. The Fahrenheit and Rankine temperature scales correspond to the Celsius and Kelvin, respectively. We do not use these other units, but some conversion factors are given in Appendix A. Regardless of the units specified initially, our approach is to convert the input to SI units where necessary, to do the calculations in SI units, and to convert the output to whatever units are desired. 

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