A fluidized-bed is a technology used in various industrial processes where solid particles are suspended in an upward-flowing gas or liquid. This creates a fluid-like behavior, allowing for efficient mixing and heat transfer. The particles are typically small and uniform, which helps maintain a stable bed that can be easily controlled. Fluidized beds are commonly used in applications such as chemical reactions, combustion, and granulation. They offer advantages like improved reaction rates and uniform temperature distribution, making them ideal for processes in industries like pharmaceuticals and energy production.