A cross-section is the name given to a hypothetical unit of area (often in units of Barns) for measuring the probability of scattering events in particles collisions. DO NOT USE THIS TAG for a physical non-probabilistic cross-section of a macroscopic object.

A cross-section is the name given to a hypothetical unit of area for measuring the probability of scattering events in particles collisions. See Beer-Lambert Law. should be used for questions about particle collision probabilities. DO NOT USE THIS TAG for a physical non-probabilistic cross-section of a macroscopic object.