A platinum resistance thermometer has a re- sistance of 200 ohms. A platinum res

Question

A platinum resistance thermometer has a re-

sistance of 200 ohms.

A platinum resistance thermometer has a resistance of 200 ohm when placed in an ice 0 degree C bath and 290.8 Ohm when immersed in a crucible containing a melting substance. What is the melting point of the substance? The temperature coefficient of the platinum is 0.00392 (degreeC)^-1 . The resistor was calibrated at a temperature of 20 degree C. Answer in units of degree C. A platinum resistance thermometer has a re- sistance of 200 ohms.

Explanation / Answer

? of platinum resistance = 0.00392 ohm/C

we know R2 = Ro(1+?*?t)

given R2 = 290.8, Ro = 200

hence ?t = (290.8 - 200)/200*0.00392 =115.82 C

hence the melting point of the substance = 115.82 celsius

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