Colloid chemistry, also known as colloidal chemistry, deals with the study of colloids. Colloids are mixtures in which the particles are small enough to stay suspended in a medium and do not settle down. The field of colloid chemistry is concerned with the properties and behavior of these particles, which may range from nanometers to micrometers in size. Synonyms for colloid chemistry include colloidal chemistry, dispersion chemistry, and particle chemistry. These terms are often used interchangeably in scientific literature to describe the study and manipulation of colloids, which have important applications in various fields including drug delivery, food science, and materials engineering.