L1 slide 17: Properties vs path functions (ENGR5003)

L1 slide 17: Properties vs path functionsFrom lectureCurrent specThird3 marks3 min

A gas in a piston-cylinder has a pressure of 5 bar and a temperature of 300 K. The piston is then moved slowly and the gas expands.

Formulas you may need

A property has an exact differential: $\oint dU = 0$ round a cycle; heat and work are inexact, written $\delta Q$ , $\delta W$ (learn this)

(a)
Which of the following is a thermodynamic property?
AHeat transferred to the gasBWork done by the gasCPressure of the gasDPath taken by the piston
[1]
(b)
Which of the following are state properties and which are path functions? Pressure, temperature, volume, internal energy, enthalpy, heat, work.
[2]