Starting from the phenomenon of life, two experiments are given to illustrate the motion of liquid molecules

Starting from the phenomenon of life, two experiments are given to illustrate the motion of liquid molecules

Drop red ink into the water, you will find that the red gradually diffuses. After a period of time, the whole is red, but much lighter
Put the salt into the water cup, and the whole water will be salty

What are some examples of molecular diffusion?

1. diffusion phenomenon: spray perfume in the corner of the house, the whole room will smell fragrant; the smell of the stir fry can be seen outside the window; if you drop the red pen water into the water, the whole cup of water will turn red.
2. Hot water is sweeter, because of the high temperature of hot water, the molecular thermal movement is intense, and the sugar dissolves and diffuses quickly

What is noise? Try to give some examples of noise in life

1. The definition of noise: from the point of view of physics, noise refers to the sound produced by the sound body when it vibrates irregularly. From the point of view of environmental protection, all the sounds that hinder people's normal rest, study and work, as well as the sounds that interfere with people's listening, belong to noise