Farenheight to Celcius Conversion Scale

farenheight  Celsius

        18   -10

        27    -5

        32     0        water freezes

        41     5

        50    10

        59    15 

        68    20

        77    25

        ...  ...

        212  100        water boils


to do conversion use

        farenheight = 32 + ( 9 * Celsius/5)