# first law of thermodynamics

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Related to first law of thermodynamics: 2nd law of thermodynamics

## first law of thermodynamics

[′fərst ‚lȯ əv ‚thər·mō·dī′nam·iks]
(thermodynamics)
The law that heat is a form of energy, and the total amount of energy of all kinds in an isolated system is constant; it is an application of the principle of conservation of energy.
References in periodicals archive ?
From (29), it can be seen that the first law of thermodynamics is showing the validity when [GAMMA] = 3H(1 - (1/[gamma])[(3[H.sup.2] - [c.sup.2]/2[a.sup.6]).sup.-1] (([gamma]([eta] + 8[H.sup.2])/8[H.sup.2]) (3[H.sup.2] - [c.sup.2]/2[a.sup.6]) - [c.sup.2]/[a.sup.6])).
(iii) Power law corrected entropy: for power law corrected entropy, we have investigated that first law of thermodynamics holds at apparent horizon for [GAMMA] = 3H(1 - (1/[gamma]) [(3[H.sup.2] - [c.sup.2]/2[a.sup.6]).sup.-1]([gamma](3[H.sup.2] - [c.sup.2]/2[a.sup.6])) [(1/[L.sup.2.sub.p] - (2 - [delta]/2)([K.sub.[delta]]/[L.sup.2.sub.p]) [(1/H).sup.2-[delta]]).sup.-1] - [c.sup.2]/[a.sup.6]).
To investigate the universality of the redefinition of Hawking temperature on the event horizon, one can investigate the validity of the first law of thermodynamics. During an infinitesimal time interval, one can write the energy flux across the event horizon as [24-26, 28, 29]
From the First Law of Thermodynamics into Friedmann Equations in Palatini f(R) Gravity
Due to the presence of this extra term, the field equations do not obey the universal form of first law of thermodynamics dE = TdS + WdV in this gravity.
We have found that the total entropy in the first law of thermodynamics involves contribution from horizon entropy in terms of area and the entropy production term.
In this paper, we restudied Padmanabhan's work that it is possible to write Einstein's equation for spherically symmetric space-time in the form of the first law of thermodynamics [14-17], but the thermodynamic quantities might not be consistent with the normal ones, especially the pressure and internal energy.
In this section, we will first calculate the thermodynamic quantities of the black hole obtained in the last section, then check the first law of thermodynamics, and finally extend the phase space to explore the phase transition behaviors of the black hole.
Now with all the thermodynamic quantities above in hand, one can check that the first law of thermodynamics
First Law of Thermodynamics. Now we investigate the thermodynamic behavior of the nonminimal f(T) gravity on the apparent horizon.
Consequently, the first law of thermodynamics can be expressed as follows:
Now, using these results as well as the first law of thermodynamics (Td[S.sub.A] = pdV + dE), we obtain

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