First Law of Thermodynamics - Edubirdie

University:
Santa Fe College
Course:
PHY 2048 | General Physics 1 with Calculus
Academic year:

2024
Views:

284

Pages:

3
Author:

Jabin F.

First law of thermodynamics:→ Conservation of energy. (i) Heat and work are mutually Convertible (ii) If an infinitesimal amount of heat do is given to the system, then Some part of it used to do some Work dw & remaining amount is used to change its internal energy.du. du= do-dw do = du+dw Eng sign Cmv. da = du-dw Sci. Sign Conv. Sq = du + sw dw= dw, tdw2 S = du-sw dw, work done due to chinge in wohome opo Ldw₂ = work done dye to Heat is some part of energy. other than charge An vdume. Applications: 1. egn of state Adiabatic est of startez of an ideal gas. d8= 0 PV=nRT => pdv +wdp =Rdt, PV = Const. vdp RdT-Plu do= du + pdv = 0 Cv=()=() U(TV) Ap ()+()=np ne du = CvdT du= - pdv CvdT = - Podv (ji) CdT +RAT = - Pdv + RdT from (i) (Cv+R) dT = vdp = Vdp (0) -vdv = = - vdp - Pav P 1 = -rs + const. -γλην+JnA A loret. = due Inp + vlnv = InA In (prr) = InA prY = A = Const. PV=RT P= RT RT VY = Const. V TVY-1 = Const. PV= RT V= RT P PLRT) = Const. pl-r-r = Const. TP = anst Y C ii) Free Expansion⇒ Adiabatic exp. In vaccum dg=0, dw = Pdv = 0 dg = du+dw du = 0 U= Const.

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