Science trivia, trivia about science

The conditions for the formation of fog are cooling and humidification, which increases the water vapor content. This is formed by radiative cooling, which mostly occurs at night and early in the morning when it is clear, breezy, and the water vapor near the surface is relatively abundant and stable, or there is a temperature inversion, which is called radiation fog in meteorology; the other is the fog formed by the horizontal movement of warm and humid air, passing through the cold ground or water surface, and gradually cooling, which is called advection fog in meteorology; Sometimes fog formed by both causes is called mixed fog. It can be seen that those who have these conditions are in late autumn and early winter, especially in the morning of late autumn and early winter.

We can also see a kind of evaporative mist. That is, cold air flows through the warm water surface, and if the air temperature is very different from the water temperature, the cold air near the water surface will condense into fog due to the evaporation of a large amount of water vapor from the water surface. At this time, there is often an inversion layer on the fog layer, otherwise the convection will dissipate the fog.

Therefore, the evaporation fog has a small range and weak intensity, and generally occurs around the pond in the second half of the year.

Smog in cities is caused by another cause, and that is human activity. Morning and evening are the peak period of heating boilers, and a large number of pollutants such as soot suspended solids and automobile exhaust are not easy to diffuse under the conditions of low air pressure and low wind, and combine with the water vapor in the low-level air, which is relatively easy to form smoke (fog), and this smoke (fog) often lasts for a long time.

The reasons for the dissipation of fog are, firstly, due to the heating of the underlying surface, the fog droplets evaporate; Second, the wind speed increases, blowing away the fog or lifting it into clouds; Then there is turbulent mixing, water vapor is transferred, heat is transferred downward, and near-surface droplets evaporate.

The duration of fog is mainly related to the dry and wet local climate: generally speaking, the fog is mostly short in arid areas, which mostly dissipates within 1 hour, while the long fog is most common in humid areas, which can last for 6 hours.

1) Increase the intake of thermogenic foodDue to the cold climate in winter, the body consumes more energy every day in order to adapt to the cold environment outside, so it is necessary to increase the intake of thermogenic nutrients. Thermogenic nutrients mainly refer to proteins, fats, carbohydrates, etc., so it is necessary to eat more foods rich in these three nutrients, especially to increase the intake of fat, such as paying attention to the intake of fatty meat when eating meat dishes, and putting more cooking oil when stir-frying.

2) Supplementation with essential methionine methionine provides a range of methyl groups necessary for adaptation to cold tolerance through transfer. The cold climate increases the excretion of creatine in the human urine, accelerates fat metabolism, and the calories released by the oxidation of synthetic creatine and fatty acids and phospholipids** need methyl cells, so more foods containing methionine should be consumed in winter, such as sesame, sunflower seeds, dairy products, yeast, leafy vegetables, etc.

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 the blue light in the sunlight is the most penetrating. A magnifying glass can ignite paper because the convex lens can focus. The compass can guide because the south side is the north pole of the geomagnetic field.

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 of the updraft next to high-rise buildings.

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

5. The magnifying glass can ignite 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. Air conditioning, automobile exhaust, cement floors, and a large number of houses are the main culprits of the greenhouse effect.

10. 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.