Physical phenomenon 2: magnetic phenomenon Two magnets attract or repel each other;
Physical phenomenon 3: energy conversion: a ball suspended by a thin wire swings in the air (conversion of gravitational potential energy and kinetic energy);
Physical phenomenon 4: liquid freezes, and ice flowers appear on the windows in winter morning;
Physical phenomenon 5: diffusion phenomenon A drop of red ink drops into a glass filled with clear water, and soon a glass of water turns red;
Physical phenomenon six: self appears in the mirror of light;
Physical phenomenon 7: boiling phenomenon The boiling water surface keeps rolling;
Physical phenomenon 8: The nature of furniture shape change has not changed. Carpenters make wood into furniture such as tables and chairs.
Extended data:
Physical phenomenon means that the shape, size, structure and properties (such as height, speed, temperature and electromagnetic properties) of a substance change without the formation of new substances, which is another way of saying physical change. In other words, a physical phenomenon refers to a physical event or process that can be directly perceived, which is different from the physical essence, which is an abstraction of the same nature of similar physical phenomena.
Light and particles in physical phenomena
When light strikes a particle, two things happen. First, when the diameter of particles is many times larger than the wavelength of incident light, light is reflected. Second, when the particle diameter is smaller than the wavelength of incident light, light is scattered, and the scattered light is called milky light.
Tindal effect refers to the scattering of light passing through colloid (such as emulsion and suspension).
When the light shines on the solution, the light is less scattered and most of the light can pass through the solution. But when it touches the colloid, the particles of the colloid will scatter light, which makes those particles have the color of scattered light.
Wikipedia says that when a beam of light passes through the colloid, a bright "path" can be observed in the colloid from the vertical direction of the incident light. This phenomenon is called Tyndall phenomenon, also known as Tyndall effect.
This is because colloidal particles are large and scatter light (the solution does not have this phenomenon-it can be used to distinguish).
Physical phenomena around us
1. Even if there is no wind, the path of paper falling from a height is tortuous. This is because each part of the paper has a different convex and concave shape, so the air speed on its surface is different during the falling process. According to the principle of fluid mechanics, there is uneven air force everywhere on the paper, which changes with the movement of the paper, so the paper keeps rolling and falling zigzag.
At the same temperature, frozen meat thaws faster in water than in air. At the same temperature, hot things cool faster in water than in air. A cup filled with boiling water cools faster when immersed in water than when immersed in air at the same temperature. The reason is that the specific heat capacity of water is larger than that of air. Under the same contact area, the heat transferred from water to meat is much higher than that from air.
Sprinkle some salt on the snowy road, it will melt quickly. All these phenomena indicate that salt is used as a snow melting agent.
When it thunders, you first see the lightning and then hear the thunder. All these phenomena show that light travels faster than sound!
At gas stations, we often see the warning of "no use of plastic barrel gasoline". We know that plastic barrel gasoline can't conduct the charge generated by friction during transportation. Too much charge accumulation will easily lead to discharge, gasoline combustion and dangerous accidents.
References:
Baidu encyclopedia-physical phenomena