Why does the higher the air pressure, the denser the air?

Quantitative understanding:

For example, if a room is filled with gas at an atmospheric pressure, if it rushes into 100 times the mass of the original room. Then its pressure increases.

The density is calculated by dividing the mass by the volume (in the room twice, the volume is constant) and the density becomes larger.

That is, the higher the air pressure, the greater the density.

Atmospheric pressure What factors are involved in the change of atmospheric pressure? How has it changed?

A: The change in atmospheric pressure is related to altitude. Atmospheric pressure is generated by the gravitational force of the atmosphere, and the higher above the ground, the thinner the atmosphere, and the lower the atmospheric pressure should be.

However, because the density of the air in relation to the gravity of the atmosphere varies unevenly with altitude, the atmospheric pressure decreases with altitude.

Changes in atmospheric pressure are also related to the weather. The atmospheric pressure in the same place is not exactly the same at different times. We know that water vapor is less dense than air, and when there is more water vapor in the air, the air density becomes less and the atmospheric pressure decreases.

Generally speaking, the atmospheric pressure on a rainy day is smaller than that on a sunny day, and a sudden decrease in atmospheric pressure on a sunny day is a precursor to impending rain. It has been raining for several days and the atmospheric pressure has become stronger, so it is expected to clear soon. In addition, changes in atmospheric pressure are also related to temperature. Because the air density becomes less when the temperature is high, the atmospheric pressure is lower when the temperature is higher than when the temperature is low.

What's the deal with standard atmospheric pressure? How is its value obtained?

Answer: Atmospheric pressure is not fixed. In order to compare the magnitude of atmospheric pressure, at the 10th International Conference on Weights and Measures in 1954, scientists established a "standard" for atmospheric pressure:

At sea level at latitude 45°, when the temperature is 0, the pressure generated by the 760 mm high mercury column is called standard atmospheric pressure. Since it is a "standard", it is necessary to pay attention to the accuracy of the values of each physical quantity when calculating according to the liquid pressure formula. From the relevant information:

The density of mercury at 0 is kilogram m3 and the g value at sea level at latitude 45° is Ox kilograms. The pressure generated by the 760 mm high mercury column is obtained.

p mercury = mercury gh = kg m3 N kg m = Pa.

The air pressure is high, for example.

There is air on top of the air, which compacts the bottom, and the separation between molecules decreases, so the greater the air pressure, the greater the density of the air.

First of all, we must know that the microscopic cause of air pressure is due to the collision between gas molecules, so there will be more molecules and trees in the unit volume of air with high density, so the probability of collision will be greater, and the natural pressure will be larger.

<> atmospheric pressure decreases as the altitude increases, while air density.

It decreases with the increase of altitude, so the air density is higher when the atmospheric pressure is high, and the air density is less when the atmospheric pressure is low.

Air density refers to the volume per unit at a certain temperature and pressure.

The mass possessed by air is the density of air. The pressure exerted by the atmosphere on the object immersed in it is called atmospheric pressure.

Abbreviated as atmospheric pressure or barometric pressure. Atmospheric pressure refers to the pressure produced by the air at a certain location on the earth, and the air on the earth's surface is subjected to gravity, resulting in atmospheric pressure.

Pressure f=ps, where p is the pressure, which is the value of the air kia.

According to this formula, the magnitude of the pressure is not only related to the pressure, but also to the area of force, so the larger the contact area, the greater the pressure.

If the force area is the same, then the higher the air pressure, the greater the pressure!

<> atmosphere. It decreases with increasing altitude, whereas air density decreases with increasing altitude, so higher atmospheric pressure means higher air density.

The relationship between air density and air pressure p= rt m.

where m is the molar mass of the gas.

is the density of the gas, r is the proportionality constant, and r is a constant for any ideal gas.

The equation is PV=NRT. There are 4 variables in this equation: p is the pressure of the ideal gas, v is the volume of the ideal gas, and n is the amount of gaseous matter.

Whereas t denotes the thermodynamic temperature of an ideal gas.

There is also a constant: r is the ideal gas constant. As can be seen, there are many variables in this equation.

Therefore, this equation is known for its many variables and wide range of applications, and it is also approximately applicable to air at room temperature and pressure.

Ideal gas equation of state.

It is derived from the study of the behavior of gases at low pressures.

However, there are some deviations in the application of the ideal gas equation of state for each gas. The lower the pressure, the smaller the deviation, and the ideal gas equation of state at very low pressures provides a more accurate description of the behavior of the gas.

The extremely low pressure means that the distance between the molecules is very large, and the interaction between the molecules is very small.

This question involves understanding the relationship between atmospheric pressure and air density. Atmospheric pressure refers to the amount of force that is caused by the atmospheric pressure of the god stove at a certain point. Air density, on the other hand, refers to the amount of air contained in a unit volume.

Although there is a certain relationship between the two, they are not directly proportional.

Atmospheric pressure is caused by the pressure exerted by air molecules in the atmosphere on the earth's surface. As the altitude increases, the effect of gravity on the atmosphere gradually weakens, so at high altitudes, the pressure in the atmosphere decreases. A lower atmospheric pressure results in fewer air molecules being present in the same volume, making the air less dense.

Air density is affected by a variety of factors, including temperature, humidity, and pressure. Under constant temperature and humidity conditions, as the atmospheric pressure decreases, the average distance between air molecules increases, and correspondingly the number of air molecules per unit volume decreases, resulting in a decrease in air density.

To sum up, the higher the atmospheric vertical pressure, the more air molecules per unit area are subjected to impact, so the number of air molecules in the same volume is higher, and the air density is relatively large. Whereas, the lower the atmospheric pressure, means that there is less impact of air molecules per unit area, so the number of air molecules in the same volume is less, and the air density is comparatively less.

The atmospheric pressure decreases with the increase in altitude, while the density of the air decreases with the increase in altitude, so the higher the atmospheric pressure, the denser air is.

The relationship between air density and air pressure p= rt m.

where m is the molar mass of the gas, which is the density of the gas, and r is the proportionality constant, which is certain for any ideal gas.

There is a close relationship between air pressure and air density. When the air pressure is high, the air density is also comparatively greater. This is due to the relationship between the pressure and density of the gas as described by the equation of state of an ideal gas.

According to the ideal gas equation of state, p = rt, where p is the pressure of the gas and the density of the gas, r is the constant of the gas hand, and t is the temperature of the gas body. In this equation, the pressure of the gas is proportional to the density while the temperature remains constant.

When the air pressure increases, the pressure increases, and the ideal gas equation of state shows that the density of the gas also increases when the temperature does not change. Higher air pressure means that there are more air molecules in the same volume, and they collide with the walls of the container more often, thus increasing the density of the gas.

It is important to note that the relationship between air pressure and air density is also affected by temperature. When the temperature increases, the gas molecules expand, resulting in a decrease in density, although the air pressure may remain the same. Therefore, considering the temperature factor, when the air pressure is high, the air density is generally larger.

What we commonly call the atmosphere is the entire layer of air that surrounds the Earth

It contains nitrogen, oxygen and carbon dioxide.

In addition to many other gases, it also contains water vapor and dust We call air with little water vapor (i.e., low humidity).

dry air", and air with more moisture (i.e. high humidity) is called "moist air".

Don't think that "dry" things are necessarily lighter than "wet" things In fact, the molecular weight of dry air is, and the molecular weight of water vapor is, so dry air molecules are heavier than water vapor molecules Under the same conditions, dry air is also denser than water vapor

The density of water vapour is only the density of dry air.

of 62 or so

It should be said that the fact that the atmosphere is located in an open space around the Earth and that there are no specific boundaries that constrain its range of motion makes it different from a gas in a closed container

For a closed container containing air, as long as the gas in the container is not saturated, then when we feed water vapor into the container, the pressure of the gas will inevitably increase

This is not the case with the atmosphere

When the atmospheric humidity in an area increases due to natural or man-made factors, the "moist air" molecules (including air molecules and water vapor molecules) in that area

It will inevitably spread to the surrounding area and the result will be "dry air" in the atmosphere of the region

The content is smaller than that of the surrounding area, and the water vapor content is greater than that of the surrounding area

This is like when soybeans are mixed with cottonseed, the density of the mixture is less than that of soybeans, so the density of moist air in this area is less than that of dry air in other areas.

In terms of cloudy and sunny days, in fact, the air humidity on cloudy days is greater than that on sunny days, so the atmospheric pressure on cloudy days is smaller than that on sunny days