A little bit about common sense and scientific knowledge

1 penguin, lion, camel, fish, ecosystem, creature, adaptation.

2 bones, muscles, blood, food.

3 water, air, sunlight.

4. Discoloration, depending on the environment of the same color.

55, 3, marine ecosystems, endangered species of marine organisms.

Raw dumplings sink and cooked dumplings float because hot air is lighter than cold air. Salt is added to make potatoes and eggs float, and salt is added to increase the density of the water. Parachutes made of plastic film can stay in the air for a long time because of the updrafts on the side of tall buildings.

We can see the blue sky because blue light is the most penetrating in sunlight. <

1. Raw dumplings will sink and cooked dumplings will float because hot air is lighter than cold air.

2. Adding salt can make potatoes and eggs float, and adding salt is to increase the density of water.

3. Parachutes made of plastic film can stay in the air for a long time because there is an updraft next to a tall building.

4. We can see the blue sky because the blue light in the sunlight has the strongest penetrating power.

5. The magnifying glass can burn the paper because the convex lens can focus.

6. The compass can guide because the south is the north pole of the geomagnetic field.

7. The iron chain is wrapped around the wheels of snow driving in order to increase friction.

8. There are fewer and fewer stars at night because the universe is still expanding.

9. Plants have the functions of producing oxygen, absorbing dust and noise, reducing the surrounding temperature, resisting wind and sand, and fixing soil and water, so a variety of trees and grasses should be planted.

10. Air conditioning, automobile exhaust, cement floors, and a large number of houses are the main culprits of the greenhouse effect.

1. Take pictures of the TV screen, turn off the camera flash and indoor lighting, so that the ** picture is clearer. Because of flash.

The reflected light from the light of the lamps and lights on the TV screen can interfere with the transmitted light of the TV picture.

2. When the quartz clock hanging on the wall stops moving when the battery is exhausted, its second hand often stops at the "9" position on the dial.

Place. This is due to the fact that the second hand is most hindered by the gravitational moment at the "9" position.

3. The sorbet is bubbling because there is a lot of invisible water vapor in the outside air, and when it encounters a very cold sorbet, it will liquefy into fog when it is cold.

The drops are surrounded by the sorbet, and it looks as if the sorbet is "bubbling".

4. When you have just been bitten by a mosquito, you won't itch when you apply soap. This is an acid-base neutralization reaction in chemistry.

5. When you go out, bring a dry battery in your bag, if the skirt has static electricity, wipe the positive pole of the battery on the skirt a few times to remove the static electricity.

I don't know what you need to know about all aspects of science involved in daily life?

Let's talk about the common sense of using the refrigerator:

1. After the new refrigerator is purchased, it should be wiped several times with a clean rag, but do not close the door after wiping it clean, and open the door to let the odor inside dissipate before powering it on.

2. After the new refrigerator is carried back, it should be left to stand for a few hours before powering on the test.

3. The refrigerator should be placed in a cool and ventilated position, and a certain amount of space should be left around it to facilitate the ventilation and heat dissipation of the refrigerator and improve its refrigeration efficiency.

4. When the machine is powered on, the temperature setting of the freezer should be adjusted at minus 18 degrees, and the temperature of the refrigerated room should be about 5 degrees. The mechanical thermostat should adjust the size of the digital gear according to the ambient temperature of the season, adjust the smaller digital gear in summer, adjust the middle gear in spring and autumn, and adjust it in the larger digital gear in winter.

5. When the machine is powered on, do not put in the food first, wait for the temperature in the refrigerator to drop and stabilize, and then slowly put in the food after the compressor starts and stops normally, and do not put too much food at one time to avoid overload of the compressor.

6. The food placed in the refrigerator should be sealed and wrapped in a container or food bag to avoid odor caused by mutual odor.