The correct statement regarding Joule – Thomson effect is ____?

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$Let T_{1}, T_{2}$ are temperature of gas before and after expansion respectively, if $T_{1} > T_{2}$ then cooling effect or positive Joule Thomson effect and also if $T_{1} < T_{2}$ then heating effect of Negative Joule-Thomson effect.

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Pressure dependence of temperature during expansion is given by Joule-Thomson coefficient i.e. ${(\frac{\partial T}{\partial P})}_{H}$

Ideal gas will show neither heating nor cooling during Joule Thomson effect

answer is D.

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Detailed Solution

When a real gas is allowed to undergo unrestricted expansion adiabatically, it undergoes cooling except for He and hydrogen. This is called positive Joule-Thompson effect due to the presence of intermolecular forces. This fact find its use in liquefaction of gases.

${(\frac{\partial T}{\partial P})}_{H} > 0; f o r m o s t g a s e s$