A container contains a substance in gaseous and liquid phases at room temperature (Fig. 6.16). The container is closed by a piston of surface area A, held back by a spring of elastic constant k. We neglect the mass of the piston. For simplicity, we neglect the volume of the liquid compared to that of the gas. The atmospheric pressure is p₀ and assumed independent of temperature.

a) Determine the temperature derivative of the gas pressure

when there is no liquid phase present in the container.

b) Determine the temperature derivative of the gas pressure

when liquid is present.

Figure 6.16

Transcribed Image Text:

dp dT