A platinum wire is used to determine the melting point of indium. The resistance
ID: 1296193 • Letter: A
Question
A platinum wire is used to determine the melting point of indium. The resistance of the platinum wire is 2.000 ohm at 20 degrees Celsius and increases to 3.072 ohm as indium starts to melt. What is the melting point of indium? (The temperature coefficient of resistivity for platinum is 3.9 x 10^-3/degree Celsius) A platinum wire is used to determine the melting point of indium. The resistance of the platinum wire is 2.000 ohm at 20 degrees Celsius and increases to 3.072 ohm as indium starts to melt. What is the melting point of indium? (The temperature coefficient of resistivity for platinum is 3.9 x 10^-3/degree Celsius)Explanation / Answer
Commonly the resistivity is considered to change linearly with temperature:
p = po