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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

  
  

Dekameter and Square Dekameter – A Short Note

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

1 dekameter = 10 meters

Dekameters are not commonly used in everyday life but can be helpful for measuring medium distances, such as the length of a swimming pool or a small field.

A square dekameter (symbol: dam²) is a unit of area representing a square with sides one dekameter long:

1 dam² = (10 m) × (10 m) = 100 m²

Square dekameters are used to measure areas like playgrounds, gardens, or small plots of land.

In summary:

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  Dekameter (dam) measures moderate lengths (tens of meters)

  
  
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  Square dekameter (dam²) measures moderate areas (hundreds of square meters)

  
  
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  Occasionally used in land measurement and construction