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Micrometer and Square Micrometer – A Short Note

A micrometer (symbol: µm), also called a micron, is a unit of length in the metric system equal to:

1 micrometer = 10⁻⁶ meters

Micrometers are commonly used to measure things too small to see with the naked eye but larger than atoms—such as cells, bacteria, and fine particles. For example, a typical human hair is about 50 to 100 micrometers thick.

A square micrometer (symbol: µm²) is a unit of area representing a square with sides one micrometer long:

1 µm² = (10⁻⁶ m) × (10⁻⁶ m) = 10⁻¹² m²

Square micrometers are used to describe microscopic surface areas, such as the surface of cells, microchips, or materials under a microscope.

In summary:

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  Micrometer (µm) measures small lengths visible under microscopes

  
  
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  Square micrometer (µm²) measures tiny areas at the microscopic scale

  
  
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  Widely used in biology, material science, and engineering

  
  

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