Planar density

Planar density refers to the measurement of how closely particles, such as atoms or molecules, are packed in a specific flat area of a material, typically in a two-dimensional arrangement. It is calculated by taking the number of particles present within a defined area and dividing by that area. This concept is important in fields like materials science and crystallography, as it helps determine the material's properties, such as strength, conductivity, and reactivity, based on how tightly atoms are arranged in layers within the structure. Higher planar density often indicates stronger interactions between particles.