Physics says that the air in the bottle expands and runs out when heated, and the atmospheric pressu

When the air in the bottle expands and runs out of the bottle when it is heated, the air pressure in the bottle decreases, but it is not"Atmospheric pressure"Decrease, atmospheric pressure refers to the air pressure outside, blowing air in the bottle, the air pressure inside the bottle will increase. As long as you understand the definition of air pressure, you can know that the formation of air pressure is caused by the impact of gas molecules on an object, and the more gas there are, the more molecules, and the greater the air pressure.

The factors that affect the air pressure are: the number of molecules, the kinetic energy of the molecule, and the volume of the gas.

When the volume of a gas with a certain mass remains the same, the higher the temperature, the stronger the high pressure; When the temperature is constant, the larger the volume, the lower the pressure.

When the air escapes, it is equivalent to the air becoming "thinner" and the air pressure becoming smaller; If you can blow in the air, the air pressure inside the bottle will increase.

I don't know what to ask.

To correct one of your descriptions first, atmospheric pressure refers to the pressure produced by the air at a certain location on the earth.

You can say the pressure generated by the air in the bottle.

The air in the bottle expands and runs out when heated, and the atmospheric pressure decreases, and the premise of this reduction is that the air in the bottle returns to its original temperature and the air pressure decreases.

The air pressure is generated by the impact of air molecules, and the more active the air molecules are (the higher the temperature), the denser the air molecules, and the greater the air pressure.

When you blow, it causes the air pressure to increase.

If you understand the phrase "the air pressure is generated by the impact of air molecules, the more active the air molecules (the higher the temperature), the greater the density of the air molecules, the greater the air pressure".

Hope mine is helpful to you.

When the air decreases, the air pressure may decrease, and whether it decreases depends on the temperature.

Blow into the bottle and the air pressure will increase.

The more gas in the bottle, the greater the air pressure, the less the gas, the smaller the air pressure, and the air expands when heated, and the air pressure increases. Beg.

It stands to reason that it would.

Adiabatic expansion, there is no heat exchange between the system and the outside world, q=0

Expanding to the vacuum, the system does not do work on external silver dispersion, w=0

According to the first law of thermodynamics, the change in internal energy u=q+w

So the internal energy does not change.

Since the internal energy is only related to the temperature, the temperature does not change.

After expansion, the volume increases, from PV=NRT,N, the first t of the mega beat does not change, and V increases, then the number of groups P decreases, that is, the pressure decreases.

The ideal gas expands adiabatic to the vacuum, and there is no heat exchange in this process, and no external work is done, so the temperature remains unchanged and the pressure decreases. So choose A

Answer] :d the internal energy of the air in the bottle is only related to its temperature when the molecular potential energy is not counted, and the internal energy decreases when the temperature decreases. When the plastic hunger stool material bottle is flattened, the volume of air in the bottle decreases, and the outside world does a lot of work on it.

Then from the first law of thermodynamics, the air in the bottle must release heat in this process, so only the d term is correct.

No change. Upper surface pressure: , s is the cross-sectional area of the upper and lower levels, and here is a cube for simplification.

Lower surface pressure: . then buoyancy:

If , it is simplified to . The pressure is to ask the question that if the bottle is filled with air and then sealed, the pressure will become smaller, because h has changed.

However, the thing used to seal it, here it should be the bottle cap, is also in the air all the time, and it has been oppressed by the air all the time. When the cap is screwed on in an air environment, the pressure of the cap will not change, that is, the pressure up and down the cap will not change. So the lid will transfer the pressure from above to the air inside the bottle.

Actually, h hasn't changed. A bottle that seals an opening in an air environment is essentially no different from "putting a piece of paper on the mouth of the bottle" in terms of pressure. The lid is under constant pressure in the air, and the only thing that can be done by screwing it onto the bottle is to restrict the air from entering and exiting.

The above statement is not easy to understand. To put it another way: the buoyant force experienced by an object is equal to the volume of water (fluid) that is discharged.

A bottle with an unscrewed lid automatically fills with air, which is all too commonplace. So the question is, why does the air stay in the open bottle? Think about it, does this bottle + air system also expel the air with such a large volume of the bottle?

If there is no outside atmosphere, is the air inside the bottle running out long ago? At this time, the bottle is screwed on with the cap sealed. What if you put this bottle in a vacuum?

The bottle, including the cap, will it be pressed by the gas inside? So why is the bottle subjected to the pressure (force) of the air inside in a vacuum? Because when the bottle is in the air, it is also oppressed by the air inside the bottle, and it is only the outside atmosphere that balances it.

The most critical reason is to maintain the air at this density, which requires pressure excitation. That's the pressure that's what comes under this pressure. So seal it or not, do not change the pressure of the air inside.

Summary. The main parts of the air compressor are the piston and cylinder; Its working principle is to compress the air through the piston to reciprocate back and forth in the cylinder; Because high-pressure air (compressed air) is used in many occasions, it is necessary to compress the air to achieve the desired effect and purpose.

After the compressed air is heated, its expansion energy will increase by thousands of times, what is the reason?

Hello, I am inquiring according to your question, please wait a moment The law of conservation of energy, dust ** is the same, dust increases a bunch of surface energy, you increase the internal energy.

The main accessories of the air rock key sensitive compressor are the piston and cylinder; Its working principle is to compress the air through the piston to reciprocate back and forth in the cylinder; Because many occasions need to use high-pressure air (compressed air) thick branches, it is necessary to compress the bright sun air to achieve the desired effect and purpose.

This statement is incorrect. According to the first law of thermodynamics, the heat absorption of a gas is equal to the work done by the gas externally, that is, the volume expansion plus the increase in internal energy. Therefore, after the gas absorbs heat, either of the two conditions of volume expansion and thermodynamic energy increase can be satisfied.

The volume does not necessarily have to expand, and the thermodynamic energy does not necessarily increase.

The first law of thermodynamics is the law of conservation of different forms of energy during transfer and conversion, and the expression is q = u + w. Expression: Heat can be transferred from one object to another, and it can also be converted to and from mechanical energy or other energy, but the total value of the energy remains the same during the conversion process.

This law has been verified by many physicists such as Myer Joule. The first law of thermodynamics is the law of conservation and transformation of energy in the field of thermal phenomena. It was only in the middle of the nineteenth century that it was established in the form of scientific laws on the basis of long-term production practice and a large number of scientific experiments.

The internal energy of the gas is equal to the heat energy plus the external work, so the heat energy increases after heat absorption, but the gas expands to do the external work, so the internal energy may increase or may not change.

Constant volume heat absorption, isothermal heat absorption.

In addition to the heat exchange between the gas and the outside world, the change of gas internal energy is also related to whether the gas does work on the outside world, when the internal energy of the gas increases, and does not do work on the outside world, the gas absorbs heat.

Gas is one of the four basic states of matter (the other three are solid, liquid, and plasma). Gases can be composed of a single atom (such as a noble gas), an elemental molecule composed of one element (such as oxygen), a compound molecule composed of multiple elements (such as carbon dioxide), etc. Gas mixtures can include a variety of gaseous substances, such as air.

The significant difference between gases and liquids and solids is that the gas particles are spaced very far apart. This interval makes it difficult for the human eye to perceive the colorless gas. Gases are fluids like liquids:

It can flow and be deformable. Unlike liquids, gases can be compressed. If there is no restriction (container or force field), the gas can diffuse, its volume is not limited, and it is not fixed.

The atoms or molecules of gaseous matter can move freely with each other.

The properties of gases are intermediate between those of liquids and plasmas, the temperature of gases does not exceed that of plasma, and the lower temperature limit of gases is degenerate quark gases [1], which is also increasingly valued [2]. The high-density atomic gas is cooled to a very low low temperature, which can be divided into bose gas and Fermi gas according to its statistical properties, and other phases can be referred to the phase list.

If you do positive work on the system at the same time, and the work is greater than the heat released, then the internal energy will definitely increase.

<> this problem seems to change the quality of the air in the bottle, but if the gas discharged from the bottle is considered together, it is still a certain mass problem, and it can still be solved by the gas law. As shown in Fig

During the process, the pressure of the air remains unchanged because the bottle is always open. Let the volume of the bottle v0 and the volume of air discharged after heating be v, then: t

27+273=300k，v=vt

57+273=330k，v

v+v According to the law of isobaric change Gai Lussac, there is: , substituting the data to solve: <> so the remaining air quality in the bottle is the original <><