In the environment, when the air pressure increases, the temperature decreases or rises

In a confined environment, the temperature decreases or rises as the air pressure increases.

1.When an airtight container filled with air is heated, the pressure increases. The situation is different for the atmosphere.

When the atmospheric temperature of a certain area rises due to a certain factor, it will inevitably cause the expansion of the air volume, and the air molecules are bound to spread to the surrounding areas. As the temperature is high, the gas molecules will move faster, which will be a factor that promotes the increase in pressure. On the other hand, as the temperature increases, the gas molecules diffuse to the surroundings, and the number of gas molecules in the area decreases, thus forming a factor that contributes to the decrease in pressure.

The actual situation is the result of the combined action of these two opposing factors. As for which of these two factors plays a major role, let's take a look at the actual situation of air pressure over continents and oceans as a function of temperature. We say that in summer the temperature is higher on the continent than on the ocean.

The air pressure on the continent is lower than that on the ocean due to the diffusion of air on the continent over the ocean; In winter, the temperature on the continent is lower than that on the ocean, and the air over the ocean spreads to the continent, which makes the air pressure on the continent higher than that on the ocean. It can be seen that diffusion plays a major and decisive role in the two factors of temperature change and molecular diffusion. It should be noted that by diffusion, we mean the lateral flow of air.

Because the longitudinal flow of air does not change the weight of the vertical column of air (some literature says that the change in air pressure due to temperature is the result of air sinking and floating, which is inappropriate), it cannot change the pressure of the atmosphere (acceleration due to gravity).

gThe effect of the change in height is completely negligible).

2.Since the total amount of atmosphere on Earth is basically constant. When the temperature in one area increases, it is often accompanied by a decrease in the temperature in another area, which opens up the possibility of air spreading from high temperatures to cold temperatures.

The result of diffusion is often that the air pressure at high temperatures is lower than at low temperatures. When we live in the northern hemisphere.

It is the southern hemisphere that receives the most heat from the sun in the middle of summer.

But it is a harsh winter that receives the least amount of heat from the sun. At this time, the air pressure in the northern hemisphere is lower than that in the southern hemisphere because the air in the northern hemisphere is spreading to the southern hemisphere. Since the total amount of the atmosphere is basically unchanged, the pressure in the Northern Hemisphere is below the standard atmospheric pressure.

Of course, the air pressure in the Southern Hemisphere will be higher than the standard atmospheric pressure. Similarly, the diffusion of air in the opposite direction will cause the Northern Hemisphere winter pressure to be higher than the standard atmospheric pressure. As a result, in the Northern Hemisphere, atmospheric pressure will be higher in winter than in summer.

Of course, changes in atmospheric pressure are complex, but it is possible to explain in detail what is said in the middle school textbook.

Pressurized work is done, and the temperature rises.

Within atmospheric pressure, the pressure is related to the temperature.

Factors influencing atmospheric pressure.

Temperature: The higher the temperature, the stronger the movement of air molecules and the greater the pressure.

Density: The higher the density, the greater the air quality and the greater the pressure per unit volume.

Altitude: The higher the altitude, the thinner the air and the less atmospheric pressure.

The pressure of a liquid is related to the depth and density of the liquid, not the quality of the liquid.

The cause of the damage pressure of the liquid historical stove: it is subject to gravity and has fluidity.

Factors influencing the pressure of the liquid: depth, density of the liquid (independent of the shape of the container, mass volume of the liquid limb spare body).

The methods of increasing the pressure are: increasing the pressure while the force area is the same or decreasing the force area when the pressure is not the same. The methods of reducing the pressure are: reducing the pressure under the condition that the force area remains the same or increasing the force area when the pressure is not the same.

If the gas is in a sealed container, the air pressure increases with the temperature, and if the gas is in the air, the air pressure decreases with the temperature.

Air pressure is the atmospheric pressure acting on the unit area, that is, the gravitational force on the vertical air column that extends upward to the upper boundary of the atmosphere on the unit area, the famous Magdeburg hemispheric experiment proves its existence, the international unit of air pressure is Pascal, referred to as Pa, and the symbol is Pa.

In meteorology, people generally use kilopascals (kpa) or hectopa (hpa) as a unit, and other commonly used units are, bar (bar, 1 bar = 100,000 pa) and centimeter mercury column (or centimeter mercury), air pressure not only changes with altitude, but also with the temperature and mu scale, and the change of air pressure is closely related to weather changes.

This is explained by the principle of thermodynamics within atmospheric pressure. As the temperature increases, the interactions between molecules decrease, convection becomes easier, and therefore the substances in the atmosphere flow upwards overall. When there is more material flowing above the atmosphere, the lower part gradually decreases, resulting in a decrease in the pressure of the entire atmosphere.

Because it is not a confined space, the normal Bernoulli equation is pv=nrt

Generally speaking, the higher the temperature, the faster the atmospheric expansion and rise due to heating, and the lower the air pressure, so in most cases, the hot area is low pressure and the cold area is high pressure, such as the equatorial low pressure belt and the polar high pressure belt. The magnitude of air pressure is related to altitude, atmospheric temperature, atmospheric density, etc., and generally decreases exponentially with the increase of altitude.

However, in addition to being related to temperature, as long as the airflow rises somewhere, the ground is low, for example, the subpolar region is formed by low pressure because of the meeting of cold and warm airflow, and the airflow rises, but forms low pressure, and the cluster infiltration area where the subtropical high is located due to the accumulation of high air pressure, resulting in the airflow sinking, but forming high pressure in the hot place, which is formed by dynamic reasons.

Topography also has a certain influence on the relationship between air temperature and air pressure. For example, the middle of Asia's topography is high and the surrounding area is low, and the Qinghai-Tibet Plateau, known as the "roof of the world", is located in the middle of the country, and is located in the first step of China's topography. The low air pressure at this time is called "cold low pressure".

During the day, there is a maximum and a low value of barometric pressure, which occurs at 9 10 o'clock and 15 o'clock 16 o'clock, respectively, and a sub-high and a sub-low value of the pulsation ridge, which occurs at 21 22 o'clock and 3 4 o'clock, respectively. The diurnal variation of air pressure is small, generally in kilopascals, and decreases with increasing latitude.

The change of air pressure is closely related to the wind and the quality of the weather, so it is an important meteorological factor. The units of air pressure commonly used are Pa (Pa), millimeter mercury column height (mm·hg), and millibar (MB). The conversion relationship between them is:

100 Pa = 1 mbar 3 4 mm mercury column height.

The instruments commonly used to measure air pressure in meteorological observation include mercury barometer, empty box barometer, and barometer. The pressure at which the vertical column of mercury is 760 mm high at a temperature of 0, and the standard atmospheric pressure was first measured by the Italian scientist Torricelli.

The relationship between temperature and barometric pressure is actually quite complex. However, in general, it can be said that the higher the temperature, the lower the air pressure. The reason is that the increase in temperature makes the air molecules more active and have higher kinetic energy, and the collisions between the molecules are more frequent, which leads to the expansion of the volume of the gas and the decrease in density, which reduces the air pressure from the round dust book.

The standard atmospheric pressure is defined under a specific temperature and pressure condition, i.e. in the case of 0 (y, the density and pressure of the air are specified as standard values. As the temperature increases, the average velocity of the air molecules increases, the average distance between the molecules expands, the volume of the air expands, and while keeping its mass constant, the density of the air decreases, and thus the air pressure decreases. Therefore, the higher the temperature, the lower the air pressure is usually lower.

It is important to note that the relationship between temperature and air pressure is influenced by many factors, such as altitude, humidity, and many more.

In addition, the density of air can be affected by a variety of factors such as air composition, atmospheric pressure, temperature, etc., so the behavior of gases is very complex. Therefore, when discussing the relationship between temperature and air pressure, it is necessary to analyze the specific conditions of the air and atmospheric environment.

The air pressure is generated because the temperature of a large number of irregularly moving molecules colliding with the container wall increases, and the molecular thermal motion accelerates, so the number of molecules colliding with the container wall per unit time increases and vice versa.