Technically the thickness of stable metal coating on another metal should be of the order of

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BPSC AE Paper 3 (General Studies) 10 Nov 2022 Official Paper
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  1. micrometer
  2. millimeter
  3. centimeter
  4. nanometer

Answer (Detailed Solution Below)

Option 1 : micrometer
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Explanation:-

When applying a stable metal coating on another metal, the thickness is typically measured in micrometers. This is because:

  • Micrometer Scale: A micrometer (µm) is 1 millionth of a meter, or 1 thousandth of a millimeter, providing a practical and economical thickness for protection and functionality.
  • Nanometer Scale: While nanometer coatings are used in specialized applications, they might be too thin for general use.
  • Millimeter/Centimeter Scales: These scales are too thick for coatings and would typically be considered layers or claddings.

Typical Thickness Ranges:

  • Electroplating: 1-30 micrometers
  • Galvanization: 5-25 micrometers
  • Anodizing: 5-25 micrometers
  • PVD and CVD Coatings: several nanometers to several micrometers, with typical industrial coatings in the micrometer range

Given these factors, the optimal thickness for a stable metal coating on another metal is micrometer

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