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Terms Used in Thermodynamics

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: Terms Used in Thermodynamics

Basic Terms:

  • System: The specific part of the universe selected for study in thermodynamics
  • Surroundings: Everything outside the system
  • Boundary: Surface separating system & surroundings

Types of System:

  • Open: Matter + Energy exchange (Δm ≠ 0, ΔE ≠ 0)
  • Closed: Only Energy exchange (Δm = 0, ΔE ≠ 0)
  • Isolated: No exchange (Δm = 0, ΔE = 0)

Properties:

  • Extensive: Properties whose magnitude depends on the amount of matter → Mass, Volume
  • Intensive: Properties independent of the amount of matter→ Temperature, Pressure

Functions:

  • State Function: Depends only on state → P, V, T, U, H, G, S
  • Path Function: Depends on path → Heat (q), Work (W)

Thermodynamic Processes:

  • Adiabatic: Process in which no heat exchange occurs → dq = 0
  • Isothermal: Process carried out at constant temperature → dT = 0
  • Isobaric: Process carried out at constant pressure → dP = 0
  • Isochoric: Process carried out at constant volume → dV = 0

Other Processes:

  • Reversible: Process which occurs infinitely slowly and can be reversed by small changes
  • Irreversible: Process which cannot be reversed completely
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