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Nanometer and Square Nanometer – A Short Note

A nanometer (symbol: nm) is a unit of length in the metric system, equal to:

1 nanometer = 10⁻⁹ meters

Nanometers are widely used to measure things at the molecular and atomic scale, such as the size of molecules, wavelengths of light, and features in nanotechnology. For example, the diameter of a DNA molecule is about 2 nanometers.

A square nanometer (symbol: nm²) is a unit of area, representing a square with each side one nanometer long:

1 nm² = (10⁻⁹ m) × (10⁻⁹ m) = 10⁻¹⁸ m²

Square nanometers are used to describe very small surface areas, such as the surface of nanoparticles or thin films.

In summary:

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  Nanometer (nm) measures very small lengths at the nanoscale

  
  
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  Square nanometer (nm²) measures extremely small areas

  
  
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  Common in nanotechnology, materials science, and molecular biology

  
  

Millimeter and Square Millimeter – A Short Note

A millimeter (symbol: mm) is a unit of length in the metric system, equal to:

1 millimeter = 10⁻³ meters (0.001 meters)

Millimeters are commonly used to measure small lengths and thicknesses in everyday life, such as the diameter of a pencil, the thickness of paper, or small machine parts.

A square millimeter (symbol: mm²) is a unit of area representing a square with sides one millimeter long:

1 mm² = (10⁻³ m) × (10⁻³ m) = 10⁻⁶ m²

Square millimeters are often used to measure surface areas in small objects, like the cross-sectional area of wires, small patches of skin, or the surface of tiny electronic components.

In summary:

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  Millimeter (mm) measures small lengths in daily life and engineering

  
  
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  Square millimeter (mm²) measures small areas on a scale larger than microscopic but still quite small

  
  
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  Commonly used in engineering, manufacturing, and medicine