A spray dryer is a device used to convert liquid solutions or slurries into dry powder. It works by atomizing the liquid into fine droplets and then exposing them to hot air. As the droplets travel through the hot air, the moisture evaporates quickly, leaving behind dry particles. Spray dryers are commonly used in various industries, including food, pharmaceuticals, and chemicals. They are particularly useful for producing powdered forms of products like milk, coffee, and instant soups. The process allows for efficient drying while preserving the quality and properties of the original material.