Chemistry

Quantum Mechanics

Thermodynamics and Statistical Mechanics

Top Answer

In thermal equilibrium, and only in thermal equilibrium, entropy is constant.

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0The second law of thermodynamics, generally stated, is that the entropy of an isolated system always increases in any natural process where change occurs. In a system at equilibrium, of course, the entropy remains constant.

Defects in crystals are known as thermodynamics defects because crystal defects are as a result of thermodynamics equilibrium and also increase in entropy has also contributed to it.

Maximum entropy is when thermal equilibrium is reached and no further vaporisation is possible.

Entropy is a thermodynamic property dealing with disorder. For example, a gas would have a higher entropy than a solid, because the molecules are more disordered. Entropy, along with enthalpy, can be used to determine the spontaneity of a reaction.

The thermodynamic entropy S, often simply called the entropy in the context of thermodynamics, is a measure of the amount of energy in a physical system that cannot be used to do work. It is also a measure of the disorder present in a system. The SI unit of entropy is JK-1 (Joule per Kelvin), which is the same unit as heat capacity

ENTHALPHY: Is the energy content of a process (chemical, thermodynamic, mechanical, etc) that can be recovered. It is also described as useful energy. ENTROPY: Is the energy content of a process (chemical, thermodynamic, mechanical, etc) that CAN NOT be recovered. It is also described as chaos.

P. A. H. Wyatt has written: 'The molecular basis of entropy and chemical equilibrium' -- subject(s): Chemical equilibrium, Entropy, Statistical thermodynamics

Yes, changed in entropy refer to changed in mechanical motion. Entropy is a measure of the number of specific ways in which a thermodynamic system may be arranged, commonly understood as a measure of disorder.

relationship between the thermodynamic quantity entropy

The second law of thermodynamics states that entropy in a closed system will continuously increase until the entropy reaches the maximum level at equilibrium.

entropy2nd opinion: thermal equilibrium

Entropy is a thermodynamic term. Re the hard boiling of an egg: You are going to a more "ordered" state , i.e., positive entropy. However, entropy in this case is overwhelmed by the -∆H which is the negative heat provided by the proteins hydrogen bonding. Thus, the energy driving force is the important term and not the entropy in this case.

it entirely depend on what kind of a system you are working with. g is the probablity (number of accessible states) and k ln g is entropy and probablity is directly related to g

An isoentropic process is a chemical or thermodynamic process in which entropy does not change. An example a reversible adiabatic process is isoentropic.

State function are those thermodynamic parameters whose values depend upon state of the system irrespective of how the state has been obtained. For example enthalpy, entropy, free energy.

when system is in equilibrium ,process is reversible hfg1/temp1=entropy1

Thermodynamic properties are specific volume, density, pressure, and temperature. Other properties are constant pressure, constant volume specific heats, Gibbs free energy, specific internal energy and enthalpy, and entropy.

An isolated system tend to equilibrium and entropy cannot decrease.

Of, relating to, or being a reversible thermodynamic process that occurs without gain or loss of heat and without a change in entropy. Source: Anwers.com

Equilibrium and maximum entropy (for the universe).

The concept of entropy was developed in the 1850s by German physicist Rudolf Clausius who described it as the transformation-content, i.e. dissipative energy use, of a thermodynamic system or working body of chemical species during a change of s

Entropy is defined by the equation: dS = δQ/T where S is entropy ("d" and δ are mathematical symbols for differential quantities) Q has units of energy - such as Joules T has units of thermodynamic temperature - such as K Since Joules are generally considered the SI unit for energy and K is the SI unit for temperature, entropy will therefore have units of J/K or J∙K-1 if you want to use SI units. It could just as legitimately be given in calories/K or BTU/°R since both of those have units of energy divided by thermodynamic temperature.

Entropy increases when ever energy is used up. Energy cannot be destroyed, but it is always lost in the form of unusable energy. Entropy is the % of unusable energy compared to usable energy in a given system.

A microscopic perspective, in statistical thermodynamics the entropy is a measure of the number of microscopic configurations that are capable of yielding the observed macroscopic description of the thermodynamic system:S=KBln Ωwhere Ω is the number of microscopic configurations, and KB is Boltzmann's constant. It can be shown that this definition of entropy, sometimes referred to as Boltzmann's postulate, reproduces all of the properties of the entropy of classical thermodynamics(shahbaz)

Entropy can be found in an irreversible process, just not directly. Since entropy is a state variable, you can invent a path connecting the initial and final states that does consist of reversible processes and then compute the total equilibrium change for that path.

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