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Varas Castellanas Cuadradas


Varas castellanas is an old Spanish unit of length, and varas castellanas cuadradas refers to the corresponding unit of area (square varas castellanas).



  • 1 vara castellana ≈ 0.8359 meters



  • 1 square vara castellana = (0.8359 m)² ≈ 0.6988 m²



This unit was historically used in Spain and Spanish colonies for measuring land and building areas. It is mostly obsolete today but can still appear in old land records.



Electron Cross Section


The electron cross section is a measure of the probability that an electron will interact with a target particle (like an atom or nucleus) during scattering or collision processes. It represents an effective area that quantifies the likelihood of interaction.



  • Typically measured in units called barns (1 barn = 10⁻²⁸ m²) or square meters.



  • Used in fields like nuclear physics, atomic physics, and materials science.



  • Cross sections vary depending on the energy of the electron and the nature of the target.



It helps scientists understand and predict how electrons scatter, absorb, or cause reactions at the microscopic level.



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