👉 A single fluid, also known as a homogeneous mixture, is a type of mixture where the components are uniformly distributed throughout the mixture at the molecular level, meaning there are no distinct phases or visible boundaries between the different substances. This fluid can exist in various states, including liquid, gas, or plasma, and its properties are consistent throughout, unlike heterogeneous mixtures where components can be easily separated. Single fluids are characterized by their lack of visible separation and consistent composition, making them unique in their behavior and interaction compared to other mixtures.