Many people should have questions! Why do we need to sprinkle the ground first when sweeping? What exactly does this do? In fact, does this have a more important relationship with our respiratory tract? In summer, the dust on the hotter ground will be more. If we do not sprinkle water, it will cause dust to fly around and damage our respiratory tract! Take a look at the following points in detail.
Bamboo silk brooms. This is because the dust has wettability. This property is due to the surface tension on the surface of the water droplets. The reduction of the Gibbs function of the total interface of the droplet system at constant temperature and pressure is a spontaneous process. It can be reduced by adsorbing and wetting dust. The surface tension on the surface of the droplet reduces the Gibbs function of the interface. The degree of freedom of the moistened dust is reduced, and the energy is reduced. Because of the adsorption of water droplets, it cannot obtain energy from the flowing atmosphere, so it will not rise.
What needs to be added is that the condition of the dust being wetted is related to factors such as its chemical properties, particle size, electrification, temperature and the length of contact time. The newly generated dust has a strong adsorption capacity and is easy to adsorb particles in the air to form a firmer gas film on its surface. Generally speaking, the smaller the dust particles, the stronger the adsorption capacity, the stronger the gas film formed, and the weaker the wettability of water.
