In accordance with the principles of aerosol spray is divided into four types.
    The first, using the Bernoulli principle. Bernoulli's principle says that in the same liquid, the velocity, pressure is small; flow rate is small, strong pressure. Fluid may flow automatically from high-pressure low. Tube through the trigeminal, the low flow of water to high-speed air flow. Water is a small drop of high-speed air torn a small drop (assuming the tap water flowing in the beginning is slow, the water column; but then gradually increase the speed after a drop by drop into). After these small water droplets emitted into the fog.
    The second, using a small tube into the water pressure caused by high-speed water flow, high flow run into obstacles in principle after the fragmented into small water droplets. Case opens like a faucet blocked with a finger. Multi-purpose household sprayer of this structure and low cost.
    The third is to allow the water to bring the charge (water is a dielectric), using the same kind of charge mutually exclusive to the principle of water into droplets. This method of droplet particles is small. The same principle is also used for car paint.
    The fourth is the principle of ultrasonic atomization. Vibration can cause the water "spray" a very high frequency ultrasound, so it's "wave" of the wavelength is very small, so it's "waves" - a very small water droplets, these small water droplets become fog.