How can the internal energy and pressure of a gas per unit volume be represented?

Liquids diffuse more slowly than gases because.....

If a gas expands at a constant temperature,then...

If a gas expands at a constant temperature,then...

The average kinetic energy of an ideal gas per molecule in $SI$ units at $25\,^oC$ will be

Two gases $A$ and $B$ are released from the two ends of a tunnel of length $100 \ m$. $A$ travels $40 \ m$ before meeting the gas $B$ in the tunnel. If the molecular weight of $B$ is $18$, what is the molecular weight of $A$ (in $.5$)?