What is the temperature of a body if the resistance of a resistance thermometer is 0.5 ohms at 0 degree celsius, 55 ohms at 100degree celsius and 10 ohms at the temperature of the body?

1 Answer
May 30, 2018

The modified equation for measuring an unknown temperature thetaθ with Resistance Temperature Detector using Linear Approximation is

theta=(R_theta-R_0)/(R_100-R_0)xx100^@Cθ=RθR0R100R0×100C
where R_0R0 is resistance measured at the ice point, R_100R100 is resistance measured at steam point and R_thetaRθ is resistance measured at unknown temperature.

Inserting given values we get

theta=(10-0.5)/(55-0.5)xx100^@Cθ=100.5550.5×100C
=>theta=17.4^@Cθ=17.4C