Thermodynamics ...

Specific heat of a substance cannot be:

The graph above represents the pressure and volume for a gas undergoing a cyclic process. Assume that Y and Z are on the same horizontal line, and Z and X are on the same vertical line. The part of the cyclic process from X to Y is an isothermal process.
If the pressure of the gas at X is $$4.0\ kPa$$, and the volume is $$6.0$$ cubic meters, and if the pressure at Y is $$8.0\ kPa$$, what is the volume of the gas at Y? (The graph is not necessarily drawn to scale)

For a process given by $$P=\dfrac { C }{ V } $$, where C is a constant, the work done by the ideal gas when the volume changes form $${ V }_{ 1 }$$ to $${ V }_{ 2 }$$ is

$$C_v$$ for helium gas $$(He)$$ is $$(in J \ mol^{-1} \ K^{-1})$$

What is the function of refrigerants in heat pumps?

A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z:

Which of the following $$p-V$$ diagrams best represents an isothermal process?

Which of the following is true in the case of an adiabatic process, where $$\gamma ={ C }_{ p }/{ C }_{ V }$$?

A system is taken from state A to state B along 2 different paths 1 and 2 . The heat absorbed and work done by the system along these 2 paths are $${Q}_{1}$$,$${Q}_{2}$$ and $${W}_{1}$$,$${W}_{2}$$

For a thermodynamics process to be reversible, the temperature difference between hot body and the working substance should be