What is the difference between using air hose hose and hard hose for small suction nozzles in machines

The degree of flexibility. The hose can keep changing its shape to fit the shape of the machine and is very convenient to use, while the hard hose is harder and difficult to change its shape and is not convenient to use. Soft air hose, also known as soft hose. Mainly used in various industries and equipment for soft connection of a hose, can transport gases, liquids and other fluids; with flexible pitch, good expansion and corrosion resistance and other characteristics.