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Hectometer and Square Hectometer – A Short Note

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

1 hectometer = 100 meters

Hectometers are not as commonly used in everyday measurements but can be useful for measuring medium-large distances, like the length of sports fields or large plots of land.

A square hectometer (symbol: hm²) is a unit of area representing a square with sides one hectometer long:

1 hm² = (100 m) × (100 m) = 10,000 m²

Square hectometers are used to measure fairly large areas, such as farms, parks, or large property plots.

In summary:

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  Hectometer (hm) measures moderate lengths (hundreds of meters)

  
  
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  Square hectometer (hm²) measures substantial areas (thousands of square meters)

  
  
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  Used in land measurement and agriculture contexts

  
  

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