A fluidized bed is a physical phenomenon occurring when a quantity of a solid particulate substance is placed under appropriate conditions to cause a solid/fluid mixture to behave as a fluid. This is usually achieved by the introduction of pressurized fluid through the particulate medium. Fluidization (or fluidization) is a process similar to liquefaction whereby a granular material is converted from a static solid-like state to a dynamic fluid-like state. When fluidized, a bed of solid particles will behave as a fluid, like a liquid or gas.An air-fluidized support surface employs the circulation of filtered air through silicone-coated ceramic beads, creating the characteristics of the fluid. Indicated for patients with stage 3 and 4 pressure ulcers or post-operative myocutaneous flaps or skin grafts.Based on different Geldart particle groups and gas velocities, several different fluidization regimes can be observed: fixed bed, homogeneous fluidization, bubbling fluidization, slugging fluidization, turbulent fluidization, and entrainment process.