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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

  
  

Picometer and Square Picometer – A Short Note

A picometer (symbol: pm) is a metric unit of length equal to:

1 picometer = 10⁻¹² meters

It is used to measure extremely small distances, typically at the atomic and molecular scale. For example, the diameter of a hydrogen atom is about 50–120 picometers. Scientists use picometers in fields like chemistry, nanotechnology, and physics to describe the size of atoms, chemical bonds, and tiny structures.

A square picometer (symbol: pm²) is a unit of area, representing a square with each side one picometer long:

1 pm² = (10⁻¹² m) × (10⁻¹² m) = 10⁻²⁴ m²

This unit is used to express extremely small surface areas, such as the cross-sectional area of atoms or molecules.

In summary:

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  Picometer (pm) measures ultra-small lengths

  
  
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  Square picometer (pm²) measures extremely small areas

  
  
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  Common in nanoscience, chemistry, and quantum physics