In the interval between the freezing point (ice point) of water and 700.0deg-C,

Question

In the interval between the freezing point (ice point) of water and 700.0deg-C, a platinum resistance thermometer is to be used for interpolating temperatures from o °C to the melting point of zinc, 692.666 K. The temperature in Celcius or Centigrade, is given by a formula for the variation of the resistance of the thermometer with temperature: R R,o 1 ATc BT Ror A, and B are constants determined by measurements at the ice point, the steam point, and the melting point of zinc. If R equals 10.05570 ohms at the ice point, 49.17237 ohms at the steam point, and 91.93592 ohms at zinc's melting point, find Ro- 1.006x10 You are correct Previous Tries s 160- 3281 Your receipt no What is A? Submit An Tries 0/10 what is B? 6.14.10 -4 Submit An Incorrect. Tries 1/10 Previous Tries

Explanation / Answer

when Tc = 0 oC R = 10.05570 ohms

substituting in the given equation Ro = 10.05570 = 1.006 x 101 ohm

substitute steam point 100oC and melting point of Zinc 419.516oC ( 692.666 K ) in the given equation

A = 0.0449 ohm/oC and B = - 6.09 x 10-5 ohm/oC2

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