Respuesta :
ΔU =q+ ∫PdV is the closed-system energy balance.
What is a Closed System ?
A closed system does not allow matter to enter or leave, but does allow energy to enter or leave.
A covered pot on the stove is approximately a closed system. An isolated system does not allow either matter or energy to enter or leave. A thermos or cooler is approximately an isolated system.
In energy balance equation for the closed system, the energy change of the system is described as the energy change of internal energy, potential energy and the kinetic energy.
For energies in transit (the energies transferring between system and surrounding), only two types of energies are involved: the heat and work.
ΔE=ΔKE+ ΔPE+ ΔU
= Q+W.
W will be the pressure volume
W = Δ(PV)
However , since it is a reversible process
W=∫PdV
Thus ΔU =q+ ∫PdV is the the closed-system energy balance.
To know more about closed system
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