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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

  
  

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