Which metal is having excellent corrosion resistance property used for making resistance thermometer. Platinum Copper Nickel None of these

Breakdown of the Problem

1. Identify the properties of the metals mentioned (Platinum, Copper, Nickel).
2. Determine which of these metals is commonly used to make resistance thermometers based on their corrosion resistance.

Relevant Concepts

• Resistance thermometer materials should have excellent corrosion resistance, stability at varying temperatures, and reliable electrical conductivity.
• We commonly consider materials for thermometers in terms of their thermal and electrical properties as well as their resistance to corrosion in various environments.

Analysis and Detail

1. Platinum:

   • Platinum is well known for its excellent corrosion resistance. It does not oxidize or corrode easily, making it suitable for high-precision applications like resistance thermometers (RTDs).
   • It retains its properties across a wide range of temperatures.

2. Copper:

   • Copper has decent conductivity but is susceptible to corrosion, especially in humid or acidic environments, which limits its use in reliable temperature sensing applications.

3. Nickel:

   • While nickel has some corrosion resistance, it is generally not as high as that of platinum. It's often used in applications involving moderate temperatures and conditions but is not the best choice for all environments.

4. None of these:

   • This option implies that none of the listed materials are appropriate. However, since platinum is a known standard, this option is not correct.

Verify and Summarize

Based on the analysis, platinum stands out as the best option owing to its superior corrosion resistance and stability across a range of operational conditions, making it the metal of choice for making resistance thermometers.

Final Answer

The metal having excellent corrosion resistance property used for making resistance thermometers is Platinum.