Convert Earth polar radius to Bohr radius Online | Free Length Converter

Earth Polar Radius

The Earth's polar radius is the distance from the center of the Earth to the North or South Pole. It measures the Earth’s radius along its rotational axis.

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  Its value is approximately 6,356.8 kilometers (about 3,949.9 miles).

  
  
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  The Earth is an oblate spheroid, so the polar radius is slightly shorter than the equatorial radius due to the planet's flattening at the poles.

  
  
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  This measurement is crucial for geodesy, understanding Earth’s shape, and satellite navigation.

  
  

Key facts:

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  Polar radius ≈ 6,356.8 km

  
  
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  Smaller than equatorial radius by about 21.3 km

  
  
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  Important for precise Earth modeling and mapping

  
  

The difference between the polar and equatorial radius reflects the Earth’s rotation and its effect on the planet’s shape.

Bohr Radius

The Bohr radius is a fundamental physical constant that represents the average distance between the nucleus and the electron in a hydrogen atom in its ground state, according to the Bohr model of the atom.

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  Its value is approximately 5.29177 × 10⁻¹¹ meters (about 0.529 angstroms).

  
  
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  Named after physicist Niels Bohr, who introduced the model in 1913.

  
  
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  It sets a natural length scale in atomic physics and quantum mechanics.

  
  
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  Used to describe atomic sizes and electron orbitals.

  
  

Key facts:

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  Bohr radius ≈ 5.29 × 10⁻¹¹ m

  
  
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  Represents the typical size of a hydrogen atom’s electron orbit

  
  
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  Fundamental to quantum physics and atomic structure

  
  

The Bohr radius is essential for understanding atomic dimensions and quantum behavior of electrons.