What are the physical reactions in life?

Answer 1

There were many physical reactions in life. The following were some common examples:
1. ** Phenomena related to mechanics **
- When the battery of the Quartz Clock hung on the wall ran out of power and stopped moving, the second hand would often stop at the "9" position on the dial because the second hand was most hindered by the gravitational moment at the "9" position.
- A misshapen mirror, the further away one is from the mirror, the more misshapen it becomes. Because the image in the mirror was formed by the reflection of the silver-plated surface behind the mirror, the uneven silver-plated surface or the uneven thickness of the glass would cause distortion. The farther the person was from the mirror, the more the reflection of the silver-plated surface deviated from the normal position, and the mirror would be more distorted.
- Sitting on the ground and traveling 80,000 miles a day, this was because the radius of the earth was about 6370 kilometers. Every time the earth rotated, the distance that the objects on its surface "walked" was about 40,003.6 kilometers, about 80,000 miles. This revealed the relationship between motion and stillness. Movement was absolute, and stillness was relative to the reference object.
2. ** Phenomena related to Optics **
- When one looked up at the starry sky on a clear summer night, the stars kept twinkling. This was because the atmospheric density distribution was unstable, causing the refracted light of the starlight to change with the atmospheric density.
- When taking pictures of the TV screen, turn off the camera flash and indoor lights, and the picture would be clearer. This was because the reflected light from the flash and lights on the TV screen would interfere with the transmitted light of the TV screen.
- The chopsticks in the water looked shorter because of the refraction of light. The reflection of trees in the water was the reflection of light. The rainbow-colored oil film on the road was the interference of light. The concave lens could be ignited because of the light gathering effect of the concave lens. The spot under the big tree was the phenomenon of small hole imaging. The reflection of people on the road was the phenomenon of straight line transmission of light. The eclipse of the sun and moon was the phenomenon of straight line transmission of light. The rainbow after the rain was the phenomenon of light dispersion. It was the refraction of light that people saw the sunrise earlier than it actually was. A car windshield slanted at a certain angle was a reflection of light.
3. ** Phenomena related to heat **
- There was an air layer in the middle of the double-layer glass. The air was not easy to transfer heat, so the double-layer glass could play the role of heat preservation and insulation.
- Meat broth or spicy soup was not easy to cool because the oily layer of vegetable soup covered the surface of the soup, preventing the water from evaporating, so it was not easy to cool.
- Before the water boils, due to the air current, the bubbles in the water will rise and vibrate up and down. Most of the bubbles will burst under the pressure of the water, and the sound of the bursting and vibration will resonate with the container, so the sound will be very loud. After the water boils, the temperature will remain the same, and the volume of the bubbles will increase. Under the effect of buoyancy, the bubbles will rise to the surface of the water before bursting. The sound will be relatively small, so there is a saying that "the water will not boil without the sound of boiling water".
- In winter, the surface of the lake froze, but there was no ice under the ice. This was the abnormal expansion of water.
- Being scalded by steam was more serious than being scalded by water because it liquefied and released heat.
4. ** Phenomena related to electricity **
- Using a heating wire to heat up was the thermal effect of the electric current, and using a microwave to heat up was because the wave had energy.
- The magnetic needle around the energized wire would deflect, which was the magnetic effect of the current. The current produced by the rotation of the generator coil was an electromagnetic induction phenomenon.
5. ** Phenomena related to sound **
- As the car drove past, the frequency of the sound gradually decreased. This was the Kepler effect.
- Obstacles couldn't stop the transmission of sound, which was the phenomenon of sound wave refraction. Listening to the rails could tell the train was coming earlier because sound traveled faster in iron than in the air. In space, a walkie-talkie was needed because sound transmission required a medium, and space was a vacuum that couldn't transmit sound.
6. ** Other phenomena **
- Clothes turned from wet to dry, clouds turned into rain, glass turned from a whole piece into a small piece, and the fragrance of flowers filled the air. During these processes, the shape and state of the substance changed, but the nature of the substance itself did not change.
- The phenomenon of thermal expansion refers to the thermal movement of molecules when an object is subjected to thermal energy, resulting in the expansion of the object's volume. The phenomenon of thermal contraction refers to the reduction of molecular thermal movement when an object is subjected to low temperature, resulting in the condensation of the object's volume.
- When two objects move relative to each other, they produce friction. The magnitude of the friction depends on the contact area and the surface toughness. The object is deformed by an external force, and the shape that can be restored after the external force is called elastic.
- The suction cup could stick to the wall tightly because of the atmospheric pressure; the hand hurt when using a needle because the pressure was inverse to the surface area when the force was applied; the boat could float on the water because the buoyancy was equal to the gravity of the water.
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