The thermodynamic process,in which the internal energy of the system remains constant is ...........

For an isothermal expansion of a perfect gas,the value of $\frac{\Delta P}{P}$ is equal to:

$A$ poly-atomic molecule $(C_v = 3R, C_p = 4R$,where $R$ is the gas constant) goes from phase space point $A (P_A = 10^5 \ Pa, V_A = 4 \times 10^{-6} \ m^3)$ to point $B (P_B = 5 \times 10^4 \ Pa, V_B = 6 \times 10^{-6} \ m^3)$ and then to point $C (P_C = 10^4 \ Pa, V_C = 8 \times 10^{-6} \ m^3)$. The path $A$ to $B$ is adiabatic and the path $B$ to $C$ is isothermal. The net heat absorbed per unit mole by the system is:

Write the first law of thermodynamics for an isothermal expansion process.

An ideal gas expands isothermally along $ab$ and does $600\,J$ of work. During the process,

During an isothermal expansion,a confined ideal gas does $-150 \, J$ of work against its surroundings. This implies that