Rt = the resistance at some temperature (C)

Ro = the resistance at 0C

t = the temperature in C

A & B = constants for a particular element which best describe its behavior with temperature

RR = Resistance Ratio Computed

RRt = Resistance Ratio at a given temperature (t)

RR(t-1) = Resistance Ratio at temperature 1C below (t)

t = the measured temperature

t2 = the lower of two(2) temperatures from the table which bracket the resistance ratio computed

RR2 = Resistance Ratio at t2

ID = Inverse difference for the temperature which has the resistance ratio which is just greater than RR

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