If in a container neither mass nor heat exchange occurs,then it constitutes a

$A$ well-stoppered thermos flask contains some ice cubes. This is an example of a

Two moles of an ideal gas are expanded isothermally from $15 \ dm^3$ to $20 \ dm^3$. If the amount of work done is $-6 \ dm^3 \ bar$,find the external pressure needed to obtain this work.

$A$ $5 \, L$ cylinder contains $10 \, mol$ of $O_2$ gas at $27 \, ^\circ C$. Due to a leak,the gas escapes into the atmosphere until the pressure inside the cylinder equals the atmospheric pressure $(1.0 \, atm)$. What is the work done by the gas?

Among the following,which is an intensive property?

The total internal energy change for a reversible isothermal cycle is