The freezing point of water is defined as 32 degrees Fahrenheit (°F) and the boiling point of water is defined as 212 °F. These reference points were first based on the freezing and boiling points of a mixture of salt ice. Rankine has the same intervals as the Fahrenheit scale but it is an absolute temperature scale and so it starts at absolute zero which is the lowest possible temperature that can be achieved. This makes Rankine and absolute variant of Fahrenheit. This means that it is simple to convert Rankine to Fahrenheit; you simply add 459.67. Similarly, to convert Fahrenheit to Rankine, subtract 459.67. For example, a temperature of 500 Rankine is 40.33 Fahrenheit.