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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

  
  

Decimeter and Square Decimeter – A Short Note

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

1 decimeter = 10⁻¹ meters (0.1 meters)

Decimeters are used to measure lengths that are larger than centimeters but smaller than a meter, such as the size of a small box or the length of a hand.

A square decimeter (symbol: dm²) is a unit of area representing a square with sides one decimeter long:

1 dm² = (0.1 m) × (0.1 m) = 0.01 m²

Square decimeters are commonly used to measure medium-sized surface areas, such as the area of a notebook page, a tile, or a small tabletop.

In summary:

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  Decimeter (dm) measures moderate lengths

  
  
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  Square decimeter (dm²) measures moderate areas

  
  
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  Used in everyday measurements, education, and practical applications