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Centimeter and Square Centimeter – A Short Note

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

1 centimeter = 10⁻² meters (0.01 meters)

Centimeters are widely used to measure everyday objects like the length of a pencil, the width of a book, or the height of a small plant.

A square centimeter (symbol: cm²) is a unit of area that represents a square with sides one centimeter long:

1 cm² = (10⁻² m) × (10⁻² m) = 10⁻⁴ m²

Square centimeters are commonly used to measure surface areas of small objects, like the size of a photograph, a piece of fabric, or the area of a label.

In summary:

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  Centimeter (cm) measures lengths at a human-scale level

  
  
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  Square centimeter (cm²) measures areas of small to medium-sized surfaces

  
  
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  Used frequently in education, crafts, science, and everyday measurements

  
  

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