3 common temperature scales

The three temperature scales that are most commonly used are Fahrenheit, Celsius and Kelvin. Celsius and Kelvin are similar in the sense that both use the same gradient; C+1 = K+1. The difference is that 0 degrees Celsius is the freezing point of water, whereas 0 degrees Kelvin is absolute zero, or -273.15 degrees Celsius. Fahrenheit follows a different gradient from Celsius and Kelvin, and therefore requires a formula slightly more tricky than a simple addition or subtraction (F=C*9/5+32 to be precise).

There is one more temperature Scale: Rankine. The Rankine is to Fahrenheit as Kelvin is to Celsius; 0 Rankine is absolute zero, but it follows the gradient of the Fahrenheit scale.