Nanoparticle size analysis is a technique used to measure the dimensions of nanoparticles, which are particles smaller than 100 nanometers. Understanding the size of these particles is crucial because it influences their physical and chemical properties, such as reactivity, strength, and behavior in biological systems. Various methods, including dynamic light scattering and scanning electron microscopy, are employed to obtain accurate size measurements. The results of nanoparticle size analysis can impact fields like pharmaceuticals, materials science, and environmental science. For instance, in drug delivery, the size of nanoparticles can affect how well they penetrate tissues and cells. Accurate size determination helps researchers design more effective nanoparticles for specific applications.