Thermodynamic Contacts: A system in thermal equilibrium

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1.9 Thermodynamic Contacts: A system in thermal equilibrium

S2: The world, a heat bath, ...
Exchange of heat energy $Δ Q$

$T_{1} = T_{2} = T$
fixed volume $V$
fixed particle number $N$

Controlled by the system:

$p$ : pressure
$μ$ : chemical potential
$S$ : entropy !!!

Examples:

many solids ( $V$ fixed)
gas in a fixed volume

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