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Micrometer


A micrometer (µm), also called a micron, is an extremely small unit of length in the metric system. It is equal to one-millionth of a meter (0.000001 meters). Micrometers are used to measure tiny objects that are invisible to the naked eye, such as bacteria, cells, or the thickness of a human hair (which is about 50 to 70 micrometers thick). The symbol for micrometer is "µm". This unit is very important in science, engineering, and manufacturing where precise measurements are needed at microscopic scales. Because it is so small, the micrometer helps scientists study the details of very small structures.


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.



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



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



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



  • Used to describe atomic sizes and electron orbitals.



Key facts:



  • Bohr radius ≈ 5.29 × 10⁻¹¹ m



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



  • Fundamental to quantum physics and atomic structure



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




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