When an ideal gas undergoes free expansion,th | vedclass

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Question

(B) For an ideal gas,the intermolecular forces of attraction are considered to be zero. During free expansion into a vacuum,the external pressure is z

Vedclass · Accepted Answer

No cooling occurs because no attractive forces exist between molecules.

Vedclass · Answer

(B) For an ideal gas,the intermolecular forces of attraction are considered to be zero. During free expansion into a vacuum,the external pressure is zero,so no work is done $(w = 0)$. According to the first law of thermodynamics,$\Delta U = q + w$. Since the process is adiabatic $(q = 0)$ and $w = 0$,the change in internal energy $\Delta U = 0$. For an ideal gas,internal energy depends only on temperature $(U = f(T))$. Therefore,$\Delta U = 0$ implies $\Delta T = 0$. Thus,no cooling or heating occurs.

When an ideal gas undergoes free expansion,then:

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