Thermodynamics and Statistical Mechanics

# What law of thermodynamics does this illustrates when two objects are in thermal equilibrium?

When two objects are in thermal equilibrium, not heat will flow between them - which is in accord with the 2nd law of thermodynamics.

This is also related to (but different from) the zeroeth law which states that if two objects are each in equilibrium with a third object, they must be in thermal equilibrium with each other.

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## Related Questions

If A,B and C are three systems and A is in thermal equilibrium with B and B is in thermal equilibrium with C then according to zeroth law of thermodynamics C is in thermal equilibrium with A.

Thermal equilibrium is the subject of the Zeroth Law of Thermodynamics. Zeroth Law of Thermodynamics. The "zeroth law" states that if two systems are at the same time in thermal equilibrium with a third system, they are in thermal equilibrium with each other.

Zeroth law of thermodynamics: If two systems are in thermal equilibrium with a third system, they must be in thermal equilibrium with each other. This law helps define the notion of temperature.

equilibrium state----- ----- ----- ----- ----- ----- ----- ----- ----- ------ ----- ----- ----- -----'Thermal Equilibrium'.

The zeroth law states that if two systems are both in thermal equilibrium with a third system, they would be in thermal equilibrium with each other if brought into thermal contact. Two systems are said to be in the relation of "thermal equilibrium" if they are linked by a wall permeable only to heat (in thermal contact), and do not change over time.

Thermal Equilibrium is achieved when two objects reach the same temperature and exchange energy through heat. Eventually the temperature between the two objects will be equal and will stop exchanging heat. At this point, They are in a state of Thermal Equilibrium.

Thermal equilibrium is established by the transfer of heat energy from the hotter object to the cooler object until both objects are at the same temperature.

No. If the two objects are at temperature equilibrium, there is no heat difference between them and thus no net flow.

At thermal equilibrium, two objects reach the same temperature. An object with a higher temperature transfers heat to an object with a lower temperature when they are in contact.

This is the zeroth law of thermodynamics: objects at different temperatures will form a thermal equilibrium. The first law of thermodynamics says that energy can not be created or destroyed but can only change form. So the cooler object has to get hotter not the other way around.

the basic principle of thermometry is that when the two bodies in contact and in thermal equilibrium will have the same temperature. basically.. its zeroth law of thermodynamics

You have to have two objects at different temperatures near each other, when two or more objects have the same temperature.

If two thermodynamic systems are in thermal equilibrium with a third, they are also in thermal equilibrium with each other. In other words if two bodies are incontact with a third and they are the same temperature (pressure.... ect.) then it is safe to say that they are also in equilibrium with each other. This law is more of a common sense check.

Thermal equilibrium is a uniform temperature throughout a system. The equilibrium temperature is the temperature at which this happens.

The four laws of thermodynamics are:Zeroth law of thermodynamics: If two systems are in thermal equilibrium with a third system, they must be in thermal equilibrium with each other. This law helps define the notion of temperature.First law of thermodynamics: Heat is a form of energy.Because energy is conserved, the internal energy of a system changes as heat flows in or out of it. Equivalently, perpetual motion machines of the first kind are impossible.Second law of thermodynamics: The entropy of any closed system not in thermal equilibrium almost always increases.Closed systems spontaneously evolve towards thermal equilibrium -- the state of maximum entropy of the system. Equivalently, perpetual motion machines of the second kind are impossible.Third law of thermodynamics: The entropy of a system approaches a constant value as the temperature approaches zero.The entropy of a system at absolute zero is typically zero, and in all cases is determined only by the number of different ground states it has.

That's when they have the same temperature, which you can measure with a thermometer.

Zeroth law of thermodynamics: If two systems are in thermal equilibrium with a third system, they must be in thermal equilibrium with each other. This law helps define the notion of temperature.First law of thermodynamics: Heat is a form of energy.Because energy is conserved, the internal energy of a system changes as heat flows in or out of it. Equivalently, perpetual motion machines of the first kind are impossible.Second law of thermodynamics: The entropy of any closed system not in thermal equilibrium almost always increases.Closed systems spontaneously evolve towards thermal equilibrium -- the state of maximum entropy of the system -- in a process known as "thermalization". Equivalently, perpetual motion machines of the second kind are impossible.Third law of thermodynamics: The entropy of a system approaches a constant value as the temperature approaches zero.The entropy of a system at absolute zero is typically zero, and in all cases is determined only by the number of different ground states it has

Heat will flow naturally from hotter objects to colder objects. To flow the other way, from colder objects to hotter objects, requires energy to be used.

To be in thermal equilibrium, it would have to have the same temperature. (It isn't.)

because the earth and the sun is not in the thermal contact with each other that is why the earth &amp; the sun is not in thermal equilibrium.

Thermal is an adjective, meaning to do with heat. Thermodynamics is a noun, a branch of physics to do with the thermal properties of materials, and has several laws which are the basis of design of heat engines and other thermal processes.

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