- #1

- 640

- 153

- Homework Statement
- All below

- Relevant Equations
- All below

Sketch a qualitatively accurate graph of the entropy of a substance

as a function of temperature, at fixed pressure. Indicate where the

substance is solid, liquid, and gas . Explain each feature of the graph briefly.

What you think about?:

dU = -P*dV + Q*dS (1)

V = C*T => dV = C*dT

Nfk*dT/2 + P*C*dT = Q*dS

Nfk/2 + P*C = Q*(dS/dT)

For a solid, i assumed f = 3, for a liquid f = 5 and for the gas, f > 5 (i think is not necessary say the obvious this is a rough approximation)

That would be the result.

as a function of temperature, at fixed pressure. Indicate where the

substance is solid, liquid, and gas . Explain each feature of the graph briefly.

What you think about?:

dU = -P*dV + Q*dS (1)

V = C*T => dV = C*dT

Nfk*dT/2 + P*C*dT = Q*dS

Nfk/2 + P*C = Q*(dS/dT)

For a solid, i assumed f = 3, for a liquid f = 5 and for the gas, f > 5 (i think is not necessary say the obvious this is a rough approximation)