First Law of Thermodynamics & Ideal Gas Law
热力学第一定律与理想气体状态方程
Theoretical Identity Description:
Conservation of energy for thermal systems: internal energy change (ΔU) equals heat absorbed (Q) plus work done ON the system (W). For ideal gases, PV/T is invariant.
Rigorous Derivation Tree
Foundational identity statement defined under standard mathematical conditions.
Targeted algebraic evaluation and parameter substitution.
CSCA Exam Triggers & Traps
Use for isothermal (T=const), isobaric (P=const), isochoric (V=const), and adiabatic (Q=0) cylinder piston processes.
Gas expansion does work ON the surroundings (W < 0). Gas compression receives work FROM the surroundings (W > 0).
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