A platinum resistance thermometer has resistances of 200.0 ohms when placed
in a 0 degrees Celsius ice bath and 253.8 ohms when immersed in a crucible contacting melting potassium. What is the
melting point of potassium? Hint: First determine the resistance of the platinum resistance
thermometer at room temperature, 20 degrees Celsius.
university physics - Elena, Tuesday, November 20, 2012 at 3:39pm
for Pt α =0.00392 (1/℃).
200/253.8=(1- 0.00392 •20)/[1+ 0.00392• (T₂-20)]
Solving for T₂ gives