Ask a physicist, it s impossible to transfer heat from a cold object to a hot object, right?

I still remember when I was studying physics in college, I did multiple-choice questions a few times, and I encountered several times to judge whether the following statement is correct, and it is impossible to transfer heat from a cold object to a high temperature object"No, it is not possible for heat to be transferred spontaneously from a cold object to a hot object"True, it is not possible to transfer heat from a cold object to a hot object without causing other changes"That's right.

The air conditioner consumes electrical work to transfer heat from a cold object to a high temperature object.

The second law of thermodynamics says that heat cannot be spontaneously transferred from a hot object to a cold object. If it is transmitted from a cold object to a high temperature object, it will inevitably cause other changes.

For example, the work of the refrigerator realizes the transfer of heat from low temperature to high temperature, but at the cost of consuming electrical energy.

The second law of thermodynamics says that heat cannot be spontaneously transferred from a cold object to a high temperature object, so what you said is not true.

That is to say, under certain conditions, heat can be transferred from a cold object to a high temperature object.

Not tight. A low-temperature object can produce more heat by doing work on a high-temperature object.

The Second Law of Thermodynamics:

It is said that it is not possible to spontaneously go from low temperature to high temperature. (for now).

If thermodynamic zero is reached, then the thermodynamic system is ready to start again.

Mistake!! Under certain conditions, there is no intervention of other energies.

It is not possible to transfer heat from a cold object to a hot object"Mistake!!

Under certain conditions, heat can be transferred from a low-temperature object to a high-temperature object (other forms of energy).

Think about how your air conditioner can drain the heat out of the room in the summer, which is cooler than the outside temperature, and you will know that this sentence is true.

You're not right.

It is not possible for heat to be transferred spontaneously from a cold object to a hot object.

This can be found in books.

Read more books.

Pay attention to the prerequisites.

Under certain conditions, it can't...

As long as there is a temperature difference within or between objects, there is a spontaneous transfer of heat from a hot object to a low temperature object, but it cannot be spontaneously carried out in the opposite direction. Heat can be forced to flow from a cold object to a high temperature object in a reverse circulation manner.

For example, air conditioners and refrigerators circulate the refrigerant inside through a compressor to transport heat from the inside to the outside where the temperature is higher than the inside. The heat pump only consumes a small amount of reverse circulation net work, which can obtain a large heat supply, and can effectively use the low-grade heat energy that is difficult to apply to achieve the purpose of energy saving.

Heat can be automatically transferred from a cold object to a positive high temperature object. () Arguments and searches.

a.That's right. b.Mistake!!

Correct answer: B

According to the laws in the heat transfer of the object. When two objects with different initial temperatures come into contact with each other, heat is transferred from the object with a high temperature to an object with a low temperature, and the heat emitted by the hot object is equal to the heat absorbed by the low temperature object without considering heat loss. Namely.

Q put q suck. Until the temperature of the two objects is equal. This process is not transferred to temperature.

According to the calorie calculation formula.

q＝cm△t。Regardless of whether an exothermic object is an endothermic object, its temperature change t, not only with q (heat emitted or absorbed).

It is also related to the mass of the object as well as the specific heat capacity of the object.

So the falling temperature of the exothermic object is not necessarily equal to the rising temperature of the endothermic object.

Because q put q suck.

Q put c1m1 t1

Q suck C2M2 T2

c1m1△t1＝c2m2△t2

To make t1 t2, then there must be.

c1 c2, m1 m2, so that two objects can only be the same substance of equal mass.

How much the temperature increases or decreases is related to the heat capacity.

In the absence of heat loss, the heat emitted by a hot object is equal to the heat absorbed by a cold object during heat transfer. However, due to the different heat capacities of different substances, the temperature changes produced by absorbing the same amount of energy are also different, so that the rising and falling temperatures are not necessarily equal.

For example, at room temperature 298K, the constant pressure molar heat capacity of benzene c benzene =, and the constant pressure molar heat capacity of toluene c toluene =. Now 1mol 50 benzene and 1mol 100 toluene are mixed, and the final temperature k is obtained regardless of heat loss.

In the process of heat absorption and release, there is no loss of heat transfer, and the heat released by one party is completely absorbed by the other party.

N benzene c benzene (k-50) = n toluene c toluene (100-k), with the number of solutions to obtain k =.

It can be seen that due to the different heat capacities, the same amount of benzene and toluene absorb the same amount of heat, benzene is more likely to heat up, and the temperature change is greater, so the final temperature, benzene heats up, while toluene only cools down.

Middle school physics, without considering heat loss.