👉 A headed fluid, also known as a colloidal fluid or emulsion, is a mixture where one substance (such as oil or water) is dispersed in another (like an aqueous solution) at the molecular or microscopic level, but remains suspended and does not settle out of the mixture over time. The dispersed phase is typically smaller than 1000 nanometers in size, which allows it to avoid gravitational separation. This suspension is stabilized by various mechanisms, including electrostatic repulsion, steric hindrance, or the presence of surfactants, preventing the dispersed phase from coalescing into larger droplets. Examples include milk (fat droplets in water), ink (pigment particles in water), and vinaigrette (oil droplets in vinegar).
