Strictly speaking, there are 4 principles of spray bottle spray together:
1. Bernoulli principle:
Bernoulli's principle says that in the same fluid, the flow rate is large, the pressure is small; the flow rate is small, the pressure is strong. The fluid will automatically flow from high pressure to low pressure. When passing through the trigeminal pipe, the low-speed flowing water flows to the high-speed flowing air. The water is torn into droplets by the high-speed air (Imagine that the water flowing out of the faucet has a slow speed at first, which is a water column; but then the speed gradually increases and becomes drop by drop). These small water droplets became fog after spraying out.

2. The principle of the high-speed water flow breaking into small water droplets after encountering obstacles:
It uses the principle of pressing water into a thin tube to cause high-speed water flow, which breaks into small water droplets when it hits an obstacle. The situation is like turning on the faucet and blocking it with your fingers. Household sprayers often use this structure, and the cost is low.

3. The principle of centrifugal force to throw the liquid out:
It is a high-speed rotating atomization disk that uses centrifugal force to throw the liquid out, and shred it into small droplets, similar to the situation when an umbrella rotates

4. Principle of ultrasonic atomization:
Vibration can cause "sprays" on the water surface. The vibration frequency of ultrasonic waves is very high, so the wavelength of its "waves" is very small, so its "sprays"-small water droplets are also very small, and these small water droplets become fog.

Usually the spray bottles used by everyone basically use Bernoulli's principle. It is made using the principle of high flow rate and low pressure, allowing air to flow out quickly from the small hole. The pressure near the small hole is small. The pressure of the air above the liquid level in the container is strong, and the liquid rises up along the thin tube below the small hole. After flowing out from the upper mouth of the thin tube, it is sprayed into mist by the impact of the airflow. In addition, the carburetor of a gasoline engine has the same principle as an atomizer.

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