In a thermodynamic process for free expansion | vedclass

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(B) Free expansion is an irreversible process in which a gas expands into a vacuum. $1$. Since the gas expands into a vacuum, the external pressure $P

Vedclass · Accepted Answer

$A$ free expansion can be plotted on a $p-V$ diagram.

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(B) Free expansion is an irreversible process in which a gas expands into a vacuum. $1$. Since the gas expands into a vacuum, the external pressure $P_{ext} = 0$, so the work done $W = \int P_{ext} dV = 0$. $2$. The process is adiabatic because it occurs in an isolated system where no heat is exchanged $(Q = 0)$. $3$. According to the first law of thermodynamics, $\Delta U = Q - W$. Since $Q = 0$ and $W = 0$, the internal energy change $\Delta U = 0$. $4$. Because the process is rapid and irreversible, the system does not pass through a sequence of equilibrium states. Therefore, it cannot be represented as a continuous path on a $p-V$ diagram. Thus, the statement that a free expansion can be plotted on a $p-V$ diagram is incorrect.

In a thermodynamic process for free expansion, select the '$WRONG$' statement out of the following options.

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