steric factor

This term is used exclusively within the fields of chemistry and molecular biology to describe the physical space occupied by atoms. It refers to the "crowding" effect where large groups of atoms physically block a reaction site, preventing other molecules from bonding. This is a distinct concept from electronic effects, which deal with charge and electronegativity rather than physical volume.

In technical literature, the term is often used interchangeably with "steric hindrance." While "steric factor" typically refers to the quantitative or qualitative influence on a reaction rate, "hindrance" emphasizes the obstruction itself. Because it is a specialized scientific term, it is never used in casual conversation or non-technical contexts.