Practice question · Sort into groups
Sort each quantity by whether a laboratory instrument can measure it directly.
Groups: Directly measurable · Only accessible through a relation
- Chemical potential
- Pressure
- Temperature
- Entropy
- Volume
Hints
- Ask which of these has an instrument with a dial for it.
- The Maxwell relations exist precisely to reach the second group through the first.
Show the answer
Directly measurable: Pressure, Volume, Temperature
Only accessible through a relation: Entropy, Chemical potential
Why
Pressure, volume and temperature all have direct instruments; entropy and chemical potential have none. The Maxwell relations equate an entropy derivative with a -- derivative, which is what makes entropy experimentally accessible at all.
Practise Thermodynamic Potentials and Maxwell Relations
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More questions on Thermodynamic Potentials and Maxwell Relations
- A system has internal energy 500 J, pressure 200 Pa and volume 0.50 m³. Compute its enthalpy in J.
- The Helmholtz free energy is the amount of energy stored in a system.
- Which statements about the chemical potential are correct?
- Legendre transforms swap natural variables without creating new physical content. Why do experimentalists…
- Complete the account of where the Maxwell relations come from.
- A system at 300 K has internal energy 2000 J and entropy 4.0 J/K. Compute its Helmholtz free energy in J.