High 1 geography near the ground and high air pressure range

What you are asking does not belong to the geography knowledge of the first year of high school, this is a question of aviation.

According to the flight altitude, it is divided into:

Low-altitude flight (altitude of 100--1000m, can be used for training, parachute, airdrop, reconnaissance, strong attack and agricultural and forestry operations, etc.).

Medium-altitude flight (altitude between 1000 and 7000 m, which can be used for training, patrol, bombing and route flight).

High-altitude flight (altitude at 7000-15000m, can be used for training, reconnaissance, bombing, interception, patrol and route flight).

Ultra-high-altitude flight (altitude greater than 15000m, can be used for reconnaissance, volley, etc.).

There are many kinds of high-altitude divisions in China, generally 0-3000 is low-altitude (above 700hpa), 3000-6000 is medium-high altitude (400-700hpa), and above 6000 is high-altitude (below 400hpa).

The air pressure values at high altitude and near the ground are not required to be mastered, so it is recommended not to spend time here, and the specific topics will tell us the most adequate conditions.

To be honest, I am also a freshman in high school, and the teacher said that there is no need to distinguish this, because you only need to know that the horizontal pressure gradient force is from high pressure to low pressure.

The air pressure near the ground is higher than the high air pressure. In the thermodynamic circulation diagram, the air near the surface is heated and rises, forming a high pressure at high altitude and a low pressure near the surface. However, the low pressure near the ground is higher than the high pressure at high altitude, because the air is dense as the altitude increases.

decreases, the air pressure decreases. The so-called high pressure and low pressure are compared with the surrounding areas at the same altitude at a certain location, and in the vertical direction, the pressure of the air locust is high at the low place, and the air pressure is low at the high place.

The air pressure near the ground is greater than that at high altitude, like a stack of thick books, and the bottom book receives the most pressure per unit area.

All barometric pressure zones refer to the pressure near the surface: the equatorial region.

High temperatures prevail all year round, and updrafts prevail, forming low pressure near the ground; The polar regions are cold all year round, forming downdrafts and high pressure near the ground. The subtropical and subpolar regions form subsidence and updrafts due to the movement of airflow, and the formation of high pressure and low pressure near the surface, the equatorial low pressure and the polar high pressure are low-pressure or high-pressure belts generated by uneven surface heating, and the formation is caused by thermal reasons. Subtropical high pressure.

The subpolar low pressure is the high pressure or low pressure formed by the movement of the air flow (not the hot Jingming force), and the cause of the formation is the dynamic cause.

Start by putting aside the thermal conditions. Put the ground lower, the higher the air density and the higher the air pressure. Then the sun came and we looked at the thermal conditions.

Taking the atmospheric circulation as an example, the equator has the most heat, forming a low pressure belt, and the polar heat is the least forming a high pressure belt, and then due to dynamic reasons, two subpolar and subtropical pressure belts are formed, which is our entire atmospheric circulation. We can see that where the heat is high, the air pressure is decreasing, and the polar air flow that receives the least heat is decreasing, and the air pressure is rising. The same example applies to monsoon circulation caused by the difference in heat between land and sea.

To sum up, the principle of hot low pressure and cold high pressure remains unchanged. On the basis of the higher the altitude and the higher the pressure, it has been changing, and we can see the direction of movement of the flow from the cross-sectional map of the entire atmospheric circulation. If we look at this problem from a philosophical point of view, it is that from the point of view of the identity of contradictions, contradictions are also changing, and we cannot treat problems from a static point of view, sleeping on things that are in motion, so we must look at problems from the perspective of development.

The closer to the ground, the denser the air is, and hence the higher the air pressure. The higher the altitude, the lower the air pressure.

The sun warms the earth, and the earth warms the atmosphere. Therefore, the tropospheric atmosphere near the surface air temperature is higher than the upper air temperature.

Air pressure, as opposed to air temperature, refers to the same level of water. They are all close to the ground, and the air expands and rises in places where the temperature is high, and the air pressure is relatively low. In places where the temperature is low, the air shrinks and sinks, and the air density atmospheric pressure is high.

The air pressure near the ground is higher than the high air pressure. In the thermal circulation diagram, the air near the surface is heated and rises, forming a high pressure at high altitude, and a low pressure forming near the ground. However, the low pressure near the ground is higher than the high pressure at high altitude, because the air density decreases and the air pressure decreases with the increase of altitude per acre.

The so-called high pressure and low pressure are compared with the surrounding area at the same height as a certain place, and in the vertical direction, the air pressure is high at the low place and the air pressure is low at the high place.

Yes, high pressure near the ground, low pressure at high altitude, low pressure at high altitude near the ground.

Look at the diagram above.

The geography of the high school is the opposite of the high and low air pressure in the same vertical direction. Near the ground is high pressure, high altitude is low pressure, near the ground is low pressure, and high altitude is high pressure. However, the high pressure at high altitude is lower than the low pressure near the ground. Here the high pressure is compared with the low pressure on the same horizontal plane.

"Hot low pressure, cold high pressure" – this means that where the temperature is relatively high in two places, the air pressure is higher than where the temperature is lower. Need an explanation? The reason is that where the temperature is high, the air is heated and goes to a higher place, and the bottom is relatively empty, so the air pressure is low.

In places where the temperature is low, the air density is larger and heavier, as if it has been compressed......You can think of ...... in terms of thermal expansion and cold contraction

The air pressure near the ground is high, and the air pressure at high is low" – meaning that in the same place, the air pressure below near the ground is higher than in the sky. Because the air below is denser, while the air at high altitude is thinner. You can think of the thin air on the Tibetan Plateau, so we have to bring oxygen tanks (of course, this is a bit exaggerated).

Hope it helps with your understanding

That is, the air pressure is low in hot places and high in cold places.

High air pressure near the ground means that the closer you get to the ground, the higher the air pressure, and the lower the air pressure away from the ground (i.e., high altitude).

Because the air pressure is determined by the density of the air, the density of the air near the ground is greater than that at the high altitude, so the air pressure near the ground is greater than that at the high altitude.

High pressure and low pressure are compared in the horizontal direction. The high and low pressure at high altitude is the comparison of the air pressure in the horizontal direction of the upper altitude.

Generally, when the low altitude is cold and high pressure, the high altitude is low pressure. When the low altitude is warm and the low pressure is high, the high altitude is the high pressure.

Vertically, the air pressure always decreases with altitude.

How is air pressure generated? The atmosphere is thin at high and the pressure zone is low.

Air pressure is defined as the weight of the air column above that height, and as the altitude increases, the length of the air column decreases, and the air pressure decreases, so the air pressure on the plateau is less than that on the plain. This is a comparison of the air pressure in the vertical direction. When at the same altitude, the lower the temperature of the air column, the denser the air is, and the higher the air pressure.

That is, "low temperature and high pressure, high temperature and low pressure".

Therefore, the comparison of air pressure should be compared at the same altitude, and different altitudes cannot be compared.