Is there something that can be completely transformed into nothing?

Formatting is divided into two kinds of [quick format] (full formatting), you will know if you format the USB flash drive with your computer, a box will pop up after clicking on the format option, there is a tick next to it, the tick means quick formatting, and the unticked means full formatting.

Quick formatting: For example, I have a USB flash drive of 10G, and there are 3G files in the USB flash drive, and I choose to quickly format, then this 3G file will be marked as [to be deleted], not formatted in the real sense! The files didn't disappear, they just went hidden.

After quick formatting, you can also see that the total remaining 10g will be displayed, of which 7g is available, and the other 3g belongs to**to be deleted, that is to say, if you put the **file into this 10**, then it will overwrite the 3g to be deleted, once it reaches 3g, no matter how high your technology is, it can't be recovered. So we sometimes delete something by mistake and find that it can be restored in time, but after a long time, it can't be recovered, just because it is overwritten. If you delete it today, your computer doesn't move it and doesn't use it, even if it is another hundred years from now, you can still recover the deleted files in time, because you don't use it, and there will be no overwriting.

Full formatting: It is a complete formatting, which is what you call a virtual position, but it takes a long time.

Something becomes nothing, depending on how it is said, for example, a small glass of water evaporates, and we say that the water is gone. It's a matter of going from being to nothing, but it's a real process. Nothing is visible in the air, but oxygen and other gases are present.

There are no absolutes in the world, it just depends on which way you think about the problem.

Intangible, non-physical things, things that have are easily transformed into nothing, such as love, hate, feelings, thoughts, sounds, electronic data, etc

Formatting is not completely transformed into nothing, the real transformation is not needed to cover the previous space.

If the formatted USB disk is not loaded with new things, there is still a certain guarantee that the data can be retrieved, but if you install the file again, there may not be many files that can be recovered.

There is no reincarnation in the world, everything has a fixed number. Whatever it is, even if you may not see it anymore, it's bound to exist in some form.

The USB drive is formatted, of course, there is nothing.

Energy is conserved, mass is indestructible, this is the basic law of nature. Energy is not matter, matter is the carrier of energy, and energy cannot exist apart from matter. Energy, in turn, facilitates the circulation and movement of matter.

The mass-energy equation e=mc 2, m is the mass, c is the speed of light, and e is the energy (the sum of various energies). This formula illustrates a simple proportional relationship between mass and energy. But it should be noted that mass cannot be converted into energy.

For example, during decay, the mass of the nucleus decreases, and the energy released can be calculated using the mass-energy equation. But this part of the mass has not disappeared, and the theory of relativity states that there is a division between the mass at rest and the mass in motion. If we take into account the mass of motion of the photons released by decay, then the total mass remains constant (in fact, it should be).

The "loss of mass" that appears to occur is not the disappearance or conversion of mass into energy, but more precisely the conversion of rest mass into moving mass, but in any case energy is conserved and energy cannot be created (the law of conservation of energy).

Yes, the simplest is the annihilation of positive and antimatter. Others, such as matter thrown into a black hole, can also convert this part of the mass into energy and release it.

It's one thing, and it's common to think of matter as another way of being for energy. Matter can be generated by pure energy field excitation, and matter can also be directly generated in the pseudovacuum state through energy borrowing.

Generally, nuclear fission and nuclear fusion are not possible, only a little, but the positive and negative particles will annihilate to produce photons. all.

Wrong. Heat cannot be spontaneously transferred from a low-temperature object to a high-temperature object. Heat can only go from hot to cold (in its natural state). It is an empirical summary of the irreversibility of all physical and chemical processes related to thermal motion in a limited space and time.

Entropy increase principle: The micro-increment of entropy in an irreversible thermal process is always greater than zero. In natural processes, the total degree of chaos (i.e., "entropy") of an isolated system does not decrease.

This statement is wrong.

The second law, Kelvin, states that it is impossible to take heat from a single heat source and turn it all into work without any other effect.

From the above expression, it can be seen that it is impossible to absorb all the work from a single heat source only under the condition that it does not produce other effects (it is forbidden by objective laws). That is to say, the second law does not prohibit the following situations: when there are other changes, the heat is all worked.

Or: "It is not impossible to take heat from a single heat source and turn it all into work", but it can only be achieved when other changes occur.

The example you gave does not absorb heat at all, so it does not directly show that the statement in the title is incorrect. Although your example sounds plausible as evidence to refute (see the end of the article).

A more appropriate example is the isothermal expansion of an ideal gas, in which it is obvious that all the heat absorbed by the gas from the outside world (a single heat source, i.e., a constant temperature heat source) is turned into useful work to propel the piston to work. Other changes occur in this process, i.e. changes in the volume and pressure of the gas. The second law does not limit the occurrence of such a process.

To understand the Kelvin formulation correctly, two things need to be noted:

1.The concept of a single heat source.

2.The implication that it does not have any other effect: it actually implies that the state of the work system does not change, i.e., the system must go through a cyclical process. Thank you for your understanding.

After this understanding, the formulation can also be changed to say that it is impossible for a system to take out a part of the internal energy of a thermostatic heat source in a cycle and completely convert this part of the energy into work or mechanical energy.

Consider why a single heat source is specified in the formulation.

We often hear the expression that mechanical energy can be unconditionally converted into internal energy, and internal energy cannot be unconditionally converted into mechanical energy. This is also a correct expression.

This sentence is highly abstract, which means that the mechanical motion that occurs in nature has a tendency to spontaneously become thermal motion, and if the outside world does not intervene, it will eventually become thermal motion (friction exists everywhere in the actual process); Conversely, it is not entirely impossible to turn thermal motion into mechanical motion, but some kind of intervention from the outside world is required to make it a reality.

In the case of an isolated system, where there is no external intervention, all forms of motion within the system (not limited to mechanical motion) will eventually become thermal motion. In this system, the internal energy never changes into other energy. Please note:

The above statement does not deny that there is a part of the internal energy in the system that can be converted into work, but for this process to occur, the other parts of the system must pay a greater price, that is, the other parts must also undergo work to change internal energy. In general, there will be no net internal energy to change work in the whole isolated system, only net work to change internal energy.

If you have a good understanding of the above two paragraphs, then congratulations, you have basically grasped the essence of the second law.

The second law of wrong thermodynamics: It is impossible to take heat from a single heat source and turn it all into work without any other effects.

But it is also possible that in other cases, all the heat is converted into work.

is wrong. I'm sure. The teacher said that.

Particular attention is paid to the fact that there is a "cyclic action" in the Kelvin narrative.

The second law of thermodynamics.

It is not possible to transfer heat spontaneously and without cost from a cold object to a high temperature object (it is impossible to transfer heat from a cold object to a hot object without causing other changes, this is expressed in terms of the direction of heat conduction).

It is not possible to take heat from a single heat source and turn it all into work without any other effect (this is from the point of view of energy consumption, which shows that the second type of perpetual motion machine is not possible).

There is nothing wrong with this statement that work can be completely converted into heat, however, it is wrong that heat cannot be completely converted into work.

Under certain conditions, heat can be completely converted into work. It's just that this process will inevitably have an impact on the outside world, so on the premise of not having an impact on the outside world, heat cannot be completely converted into work.

If the resultant force of the force experienced by the object is f, and the displacement direction of the initial motion and the final motion is the same as f, then the object does positive work; If the resultant force of the force experienced by the object is f, and the displacement direction of the initial motion and the final motion is opposite to f, then the object does negative work; Work is a scalar quantity, the positive or negative of the work does not represent the magnitude, and the work of +3j is smaller than the work of -5j.

That's how the second law of thermodynamics says it, and it's a summary of a lot of facts, and there's no why.

Assuming that energy can be turned into success, then if the temperature of the sea drops by one degree, the world's energy crisis will be solved

According to the conservation of energy, it can be seen that before and after the conversion of matter and energy, etc., are equal, but the converted form will not be a substance or anything else.

Therefore, the first part of the above sentence is not true. Work is not completely converted into heat, and heat is not completely converted into work.

"Work can be completely turned into heat, but heat cannot be completely turned into work", this sentence is wrong because work cannot be completely turned into heat.

Work cannot be completely turned into heat, and heat cannot be completely turned into success... The transition between the two is not possible.

The second theorem of thermodynamics refers to the total amount of heat contained in an object. If all the heat is converted into work, isn't its temperature absolute 0 degrees? In fact, there is no such thing as an absolute 0 degree, so work can be completely converted into heat, and heat cannot be completely converted into work.

For example, the moving object will definitely stop due to friction, and the air and ground will generate heat.

And machines that are driven by heat energy will definitely lose heat.

There will be loss in the conversion process! This sentence ignores the ...... of attrition conditionsSo it's wrong.

Heat cannot be completely converted into work without other effects.

It is conditional, in the isothermal process, all the internal energy does the work externally, and the second law of thermodynamics means that all the heat cannot be done externally without other effects, and the object cannot reach absolute zero.

Yes, but it must cause other forms of energy change (the second law of thermodynamics), and it is not possible to take heat from a single heat source and convert it completely into useful work without other effects. But as long as there are other situations that can participate in the transformation and loss, it can be achieved.

In real life, heat cannot be fully converted into work, and there are different degrees of loss according to the precision of the instrument. It's just a matter of the amount thereof. Like a wind turbine, you have to wear out the equipment and so on.

There are two ways to interpret it.

1. The heat (or internal energy) of an object cannot be used entirely to do work, otherwise it will be reduced to absolute zero, which does not conform to the third law of thermodynamics.

2 The heat absorbed by an object from a single heat source (this part of the heat) can be used entirely to do work, but it must cause other changes, the law of heat duality.

Not according to the second law of thermodynamics:

One of them is expressed as "It is not possible to take heat from a single heat source and convert it completely into useful work without other effects." ”

No, there is a loss of any energy conversion.

Theoretically, it is possible, but now human beings simply cannot do this, even hydrogen fusion cannot be completed by human beings, so now the world's nuclear power plants rely on nuclear fission, and there are no nuclear fusion power stations. But in the future, it will definitely be.

At least not now.

According to the second law of thermodynamics, the efficiency of a heat engine cannot reach 100%, that is, the heat energy can be completely converted into other forms of energy (including electrical energy) in a closed system. Therefore, in this sense, the answer to the question of lz is no. However, for an open system, the thermal energy in the system can be completely converted into electrical energy, but there will be corresponding changes outside the system (such as the need for continuous energy supply, or the need for initial temperature differences, etc.).

1l francisfans false, a purely resistive circuit can convert 100% of electrical energy into heat, but the reverse is not true.

Absolutely impossible. I can assure you, but electrical energy can be completely converted into heat. It is a theorem that the transformation of energy has a direction.

It depends on whether it is a pure resistive circuit. In junior high school textbooks, the default circuit is pure resistive circuit, and it can be completely converted.

No, the efficiency has not yet exceeded 50%.

Theoretically yes, in practice no.

The Labor Contract Law stipulates that students are not allowed to sign labor contracts; The regulations of each company will be different, we generally get the graduation certificate if the 3-month probation period is completed, then directly become a regular; If you want to pay for it, you can talk to the company to see if you can increase it.

If so, you can propose to formally sign the labor contract and make up for the part of the salary that is less if the employee is regularized at the normal time. Just personal advice.