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Mile and Square Mile – A Short Note

A mile is a unit of length used mainly in the United States and the UK. One mile equals 5,280 feet or approximately 1.609 kilometers. It is commonly used to measure long distances, such as the length of roads, travel routes, or large-scale maps.

A square mile (written as mi²) is a unit of area. It represents the area of a square that is one mile on each side. One square mile equals 640 acres or approximately 2.59 square kilometers. It is often used to measure large land areas, such as cities, regions, or forests.

In summary, a mile measures distance (one-dimensional), while a square mile measures area (two-dimensional). The distinction is important in geography, land surveying, and transportation planning.

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