Geographical barometric pressure difference is urgent! Urgent! Urgent!

The difference in air pressure geographically is a very important concept. To understand it, it can be understood in the following ways:

First of all, the difference in air pressure is the difference in air pressure. Then air pressure is also the pressure of the air, which will be learned in junior high school physics, and in layman's terms, it is the squeezing force of the air on its container. For a variety of reasons, geographically, the air on the surface of the earth has different pressures due to different densities, that is, different air pressures.

And the difference between two places, or between two points, is the difference in air pressure.

Secondly, if there is a difference between the air pressures, one will inevitably be relatively high and the other relatively low. We collectively refer to this as high and low pressure. In fact, when it comes to actually analyzing a problem, this is a relative concept.

For example, when analyzing the sea and land winds, the ocean surface is high during the day and low at night, which does not necessarily mean that the air pressure at night is necessarily higher than that during the day, but refers to the air pressure relative to the land. The difference in air pressure is used to measure the difference in air pressure, just like the altitude.

Thirdly, the pressure difference in geography is an extremely important factor that causes many geographical phenomena. Among them, the zonal law is based on this basis. Later in high school, such as atmospheric circulation, wind, cyclones, etc., all need this concept as a foundation.

Finally, there are many factors that affect air pressure, and it is only necessary to understand the essence of this at the high school level, that is, the internal factor of air pressure change is the change in the density of the gas.

If we only talk about the air pressure difference, the comparison of the vertical air pressure is in line with the principle of "high and low and high below", that is, the higher the altitude, the thinner the air and the lower the air pressure; The further down, the higher the air pressure. The comparison of the horizontal air pressure is in line with the principle of "high and low low", that is, the bending of the isobaric face to the high place is high pressure, and the bending to the low place is low pressure.

Does it refer to high air pressure and low air pressure?

High air pressure means that the air pressure in one place is higher than the surrounding area, and you can think of it as because the air sinks and accumulates, and it is denser than other places, isn't it "high pressure". The same is true for understanding low air pressure.

For a comparison of the official statement, you can see the link below.

If you bend upwards, it means that the air pressure is high and the temperature is low, and you bend downwards and vice versa.

The difference in air pressure is the horizontal pressure gradient force, and the wind direction is affected by the horizontal pressure gradient force.

From high pressure to low pressure.

The answer should be d....The lower the air pressure, the lower the boiling point, so the air pressure of c and d is higher than that of a and b, and the wind direction is affected by the horizontal pressure gradient force and the geostrophic deflection force without considering the friction force, and the direction of the barometric pressure gradient force is from the high pressure to the low pressure, so it is indeed the east wind if the geostrophic deflection force is not considered; However, the geostrophic deflection force will change the direction of the wind, and the northern hemisphere is to the right, which in the diagram is to deflect upwards, and eventually form a southerly wind.

Child, the east wind only takes into account the horizontal pressure gradient force. The geostrophic deflection force is not taken into account. Because it is the Northern Hemisphere, the geostrophic deflection force is to face the direction of the wind and then deviate to the right.

So it should be a southerly wind!! After all, as long as the wind is not at the equator, it is affected by three forces, the horizontal pressure gradient force, and then the friction force and the geostrophic deflection force... Here there are only two forces as friction is not considered.

The boiling point of two points of CD is higher than that of two points of AB, so the air pressure is high. Therefore, if you only consider the pressure gradient force, it is the east wind!! However, with the addition of geostrophic deflection force, the wind direction will change to a state of parallel to the isobars without friction.

So it should be a southerly wind!!

It is necessary to consider the geostrophic deflection force as well as the season at that time

The condition you give cannot be determined, because it should be based on the numerical value, and the absence of your condition cannot be determined. Let's describe the detailed process of how to determine the isobar diagram! Hope it helps.

An isobaric line is a line connecting points with equal air pressure on a horizontal plane. To interpret the isobar diagram, we should first identify the basic form of the pressure field, then judge the magnitude and direction of the wind, and finally analyze the weather changes. The basic idea of analyzing isobar diagrams is as follows.

1) Judge the high-pressure center and low-pressure center: the value on the isobar line decreases from the center to the surrounding for the high-pressure center; The value on the isobar line increases from the center to the periphery, and the center of low pressure increases.

2) Judge the level of air pressure in the horizontal and vertical directions

Horizontally: the high-pressure area is a downdraft, and the weather is clear; The area of low pressure is an updraft, and it is mostly cloudy and rainy.

Vertically: high air pressure near the ground, low air pressure at high level; The terrain is high and the air pressure is low, and the terrain is low and the air pressure is high.

3) Judge the high-pressure ridge (line) and low-pressure trough (line):

High-pressure ridge (line): The highest bend in the isobar, the value from high to low is the high-pressure ridge (similar to the ridge in the contour map).

Low pressure trough (line): The place where the largest bend in the isobar line is the low pressure trough (similar to the valley in the contour diagram).

4) Judge the saddle: the intersection of two high pressures and two low pressures in the saddle country, the air pressure value is lower than the high pressure center and higher than the low pressure center.

5) Judge the direction and strength of the wind.

The wind direction in the near-surface pressure field in the Northern Hemisphere is from high pressure to low pressure and diagonally crosses the isobar to the right. The wind direction in the near-surface pressure field in the Southern Hemisphere is from high pressure to low pressure and diagonally crosses the isobar to the left.

In the high altitude, the wind direction is parallel to the isobar.

Wind magnitude: Depends on the horizontal pressure gradient force. In the same image, the denser the pressure line, the stronger the wind; The sparser the isobar, the less wind.

The temperature is high and the air flow rises, so the ground is said to be low pressure; The temperature is low, and the air flow sinks to the ground for high pressure;

Generally speaking, in winter, the land is the center of high pressure, and the ocean is the low subcenter. In summer, the land is the center of low pressure, and the ocean is the center of high pressure!

The first ridge of the reed:

Because PM is greater than PN, the wind blows from M to N

Because it is in the northern hemisphere, it is biased to the right.

So for which is near the ground, is the cherry juice belt high in the air.

Question 2. When high altitude, the wind direction is parallel to the isobar, so I have done the original question before, and I remember that the teacher seems to say this, I hope it will help you (* hee hee......

Hello classmates, this is a high school physical geography course, I was better at geography in high school, I hope the answer can be helpful to you:

There is a mantra that works: hot low pressure, cold high pressure (this is the same whether it is near the ground or in the upper atmosphere), cold air is cold and heavy, so it does a sinking movement, and warm air is warm and light so it rises.

The greater the horizontal pressure gradient force, the stronger the wind, and the wind blows from high pressure to low pressure, with the southern hemisphere deflecting to the left and the northern hemisphere deflecting to the right.

I've been struggling with this content for a long time when I'm a freshman in high school, but it's not difficult to think about it carefully, I hope it can help you!

This is the simplest of the three major circulations, the thermal circulation, the other two are the three-loop circulation and the monsoon circulation, which you will learn later in the future.

As the name suggests, a thermodynamic circulation is a ring created by the difference in the amount of heat received.

As shown in the figure, when there is no heat difference, the isobaric surface is parallel to the ground, when the heat received at point A increases, the atmosphere at point A is heated, expands and rises, and the air pressure becomes lower, while relatively speaking, (note that it is relative) the temperature at points B and C is lower, the air pressure is higher, and the gas cooling decreases. In this way, on the same level near the ground, a pressure difference is generated, forming a part of the circulation (high pressure B, C flow to low pressure A), at high altitude, the air flow that rises by heating expansion at point A gathers at point A, and the high air pressure of B and C is lower than that of point A, and the high air pressure flows from A to B and C, thus forming a circulation. (Note that thermodynamic circulation comparisons are all compared to points on the same horizontal plane.)

1. Air pressure is affected by altitude, in the stratosphere, the higher the altitude, the lower the air pressure (imagine a balloon flying into the sky, the higher it flies, the bigger it is, this is because the air pressure inside the balloon is greater than the air pressure outside).

2. Temperature affects air pressure because the gas expands and contracts, affecting the volume of the gas.

3. When the airflow rises, then the rest goes from the low place to the high place, and the air pressure in the low place is low.

As shown in the figure, the altitude of each contour line is marked first, and then the knowledge that the air pressure is lower due to the higher the altitude. We list the changes in the contour plot (see Figure 2) and then change it to a section plot like this one below (Figure 3). Draw it point by point, and in the end, it's basically the same as item A.

The air pressure is low at high altitude, so choose A

The isobaric side at AB is bent downwards and at C is bent upwards.