Particle size is a key aspect in various research fields such as materials science, environmental science, pharmaceuticals, and nanotechnology. It refers to the dimensions of individual particles of a substance, typically ranging from nanometers to millimeters. Particle size analysis involves measuring and characterizing the size distribution of particles in a sample, which can affect the physical, chemical, and mechanical properties of the material. Understanding and controlling particle size is crucial for optimizing the performance of a wide range of products and processes, including drug delivery systems, catalysts, and paints. Various techniques such as laser diffraction, microscopy, and dynamic light scattering are commonly used to measure and analyze particle size.