The volume of an ideal gas is $1 \, L$ and its pressure is equal to $72 \, cm$ of mercury column. The volume of the gas is made $900 \, cm^3$ by compressing it isothermally. The increase in the pressure of the gas will be ...... $cm$ of mercury.

In an isothermal expansion,what happens to the internal energy of the gas?

$Assertion :$ The isothermal curves intersect each other at a certain point.
$Reason :$ The isothermal changes take place rapidly,so the isothermal curves have very little slope.

Select the $WRONG$ statement from the following. For an isothermal process:

Two identical containers $A$ and $B$ with frictionless pistons contain the same ideal gas at the same temperature and the same volume $V$. The mass of the gas in $A$ is ${m_A}$ and that in $B$ is ${m_B}$. The gas in each cylinder is now allowed to expand isothermally to the same final volume $2V$. The changes in the pressure in $A$ and $B$ are found to be $\Delta P$ and $1.5 \Delta P$ respectively. Then:

The internal energy of an ideal gas increases during an isothermal process when the gas is