$A$ balloon filled with helium ($32^{\circ} C$ and $1.7 \; atm$) bursts. Immediately afterwards,the expansion of helium can be considered as:

If a Van der Waals gas expands freely,then the final temperature is:

What is an irreversible process and what is a reversible process?

$Assertion :$ In free expansion of an ideal gas,the entropy increases.
$Reason :$ Entropy increases in all natural processes.

$A$ process can be reversible if

$A$ container with insulating walls is divided into two equal parts by a partition fitted with a valve. One part is filled with an ideal gas at a pressure $P$ and temperature $T$,whereas the other part is completely evacuated. If the valve is suddenly opened,the pressure and temperature of the gas will be